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    • Posted by Akash Yadav 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Chauhan 10 months, 2 weeks ago

    Firstly we will reduce nitrobenzene to aniline by sn + HCl and then reacting with NaNO2 + HCl and a diazonium salt is prepared and later reacted with CuCN C6H5CN is prepared then further is treated with LiAlH4 then C6H5CH2NH2 is prepared then is treated with HNO2 this benzylalcohol is prepared

    0Thank You

    Nikhil Bolan 11 months ago

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    • Posted by Ritesh Kumar 11 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Sonal Maurya 9 months, 2 weeks ago

    It state that in volatile liquid the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution

    0Thank You

    Sumit Modanwal Modanwal 11 months ago

    The partial vapour pressure of the gas in liquid is directly proportional to the mole fraction of the gas

    2Thank You

    Ritesh Kumar 11 months ago

    State Raoult’s Law.

    3Thank You

    ANSWER

    • Posted by Keshav Garg 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sonal Maurya 9 months, 2 weeks ago

    Oxidation no. of cn is -1

    0Thank You

    Alka Rajput 11 months, 1 week ago

    Chemistry file decorated idea

    3Thank You

    ANSWER

    • Posted by Rahul G 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Keshav Garg 11 months, 1 week ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    4Thank You

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    • Posted by Raushan Raj 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Umam Siddiqui 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Rashi Sharma 11 months ago

    Because of High electronegativity.

    0Thank You

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    • Posted by Deepak Otti 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Azaz Ali 11 months, 1 week ago

    Which have non super imposses image

    1Thank You

    ANSWER

    • Posted by Mohammed Mathrab 11 months, 1 week ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Anchal K. 11 months, 2 weeks ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Umang Choraria 11 months, 2 weeks ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sadiya Shaikh 10 months, 2 weeks ago

    2 Facial and maridonal

    0Thank You

    Vanshmittal Mittal 11 months, 2 weeks ago

    2

    1Thank You

    ANSWER

    • Posted by Puna Nunia 11 months, 2 weeks ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Account Deleted 11 months, 2 weeks ago

    Refer ncert textbook...

    0Thank You

    ANSWER

    • Posted by N . 11 months, 3 weeks ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Garg 11 months, 1 week ago

    A

    0Thank You

    Soumak Paul 11 months, 2 weeks ago

    A

    1Thank You

    ANSWER

    • Posted by Suhani Ahari 11 months, 4 weeks ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Urvashi Vashist 11 months, 3 weeks ago

    a substance or mixture for use in chemical analysis or other reactions.

    2Thank You

    Shraddha2501 Saxena 11 months, 3 weeks ago

    chemical taking part into chemical reaction and convert into products

    2Thank You

    ANSWER

    • Posted by Akshit Mohanty 1 year ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Shanika Sharma 11 months, 1 week ago

    The solubility of a solute in a given solvent follows the rule 'Like dissolves like'. Glucose contains five and sucrose contains eight −OH group. These −OH groups form H-bonds with water. As a result of this extensive intermoleeular H-bonding, glucose and sucrose are soluble in water. on the other hand, benzene and cyclohexane do not contain −OH bonds and hence do not form H-bonds with water. Moreover, they are non-polar molecules and hence do not dissolve in polar water molecules.

    0Thank You

    Samiksha Sami 11 months, 3 weeks ago

    Do not form H-bonds with water.

    0Thank You

    Palak Khandelwal 1 year ago

    Because of hydrogen bonding

    4Thank You

    ANSWER

    • Posted by Jo Merry 1 year ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Samiksha Sami 11 months, 3 weeks ago

    reduction reaction of nitroethane converts Ethane nitrile to ethylamine

    1Thank You

    Aseem Mahajan 1 year ago

    <font face ="Times New Roman">hydrogenation as i remember

    3Thank You

    ANSWER

    • Posted by Prerna Netam Prerna Netam 1 year ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Gyan Kumar 1 year ago

    Option 2 is right ans

    1Thank You

    Aseem Mahajan 1 year ago

    <font face ="Times New Roman">3rd option literally says tertiary in itself

    2Thank You

    ANSWER

    • Posted by Shivakant Modanwal 1 year ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Ajay Rana Rana 1 year ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

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    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    Posted by Hardik Chauhan 1 year ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Hardik Chauhan 1 year ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    ANSWER

    • Posted by Uday Indoliya 1 year ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Lucky Namdev 1 year ago

    0.9652

    2Thank You

    ANSWER

    • Posted by Timish Mehra 1 year ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sadiya Shaikh 10 months, 2 weeks ago

    It is applicable weak electrolytes

    0Thank You

    Gyan Kumar 1 year ago

    Kohlrausch law is used for degrees of dissociation of weak electrolyte, Kohlrausch law is used for solubility.

    0Thank You

    ANSWER

    • Posted by Ashutosh Singh 1 year ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Sonal Maurya 9 months, 2 weeks ago

    CH3CH=CH2 +Hbr/H2O2 = CH3CH2CH2Br + NaOH/H* = CH3CH2CH2OH

    0Thank You

    Keshav Chauhan 10 months, 2 weeks ago

    CH3 - CH = CH2 + BH3 = CH3-CH2-CH2OH

    0Thank You

    Rudra Dwivedi 1 year ago

    CH3-CH=CH2 + H2O. →

    3Thank You

    ANSWER

    • Posted by Princy Princy 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Rudra Dwivedi 1 year ago

    Bio Diesel is best topics

    0Thank You

    Nikhil Kumar 1 year, 1 month ago

    Which class

    0Thank You

    ANSWER
    General Instructions: Read the following instructions carefully. There are 33 questions in this question paper with internal choice. SECTION A consists of 16 multiple-choice questions carrying 1 mark each. SECTION B consists of 5 short answer questions carrying 2 marks each. SECTION C consists of 7 short answer questions carrying 3 marks each. SECTION D consists of 2 case - based questions carrying 4 marks each. SECTION E consists of 3 long answer questions carrying 5 marks each. All questions are compulsory. Use of log tables and calculators is not allowed. SECTION A The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark. There is no internal choice in this section. 1.Which of the following solutions will have the highest conductivity at 298 K? 0.01 M HCl solution 0.1 M HCl solution 0.01 M CH3COOH solution 0.1 M CH3COOH solution 2.The vitamins which can be stored in our body are: Vitamin A, B, D and E Vitamin A, C, D and K Vitamin A, B, C and D Vitamin A, D, E and K 3.What is IUPAC name of the ketone A, which undergoes iodo form reaction to give CH3CH=C(CH3)COONa and yellow precipitate of CHI3? 3-Methylpent-3-en-2-one 3-Methylbut-2-en-one 2, 3-Dimethylethanone 3-Methylpent-4-one 4.Which of the following is not correct? In haloarenes, the electron pairs on halogen atom are in conjugation with -electrons of the ring The carbon-magnesium bond is covalent and non-polar in nature. During SN1 reaction, the carbocation formed in the slow step being sp2 hybridised is planar Out of CH2= CH-Cl and C6H5CH2Cl, C6H5CH2Cl is more reactive towards SN1 reaction 5.Which of the following is not correct? In haloarenes, the electron pairs on halogen atom are in conjugation with -electrons of the ring The carbon-magnesium bond is covalent and non-polar in nature. During SN1 reaction, the carbocation formed in the slow step being sp2 hybridised is planar Out of CH2= CH-Cl and C6H5CH2Cl, C6H5CH2Cl is more reactive towards SN1 reaction 6.Match the properties with the elements of 3d series: Lowest enthalpy of atomisation Sc shows maximum number of oxidation states Mn transition metal that does not form coloured compounds Zn Ti (i) (r), (ii) (q), (iii) (p) (i) (r), (ii) (s), (iii) (p) (i) (p), (ii) (q), (iii) (r) (i) (s), (ii) (r), (iii) (p) 7.In which of the following solvents, the C4H8NH3+X– is soluble; ether acetone water bromine water 8.Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent? Turbidity will be observed within five minutes No turbidity will be observed Turbidity will be observed immediately Turbidity will be observed at room temperature but will disappear after five minutes. 9.Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst Due to the activation of benzene ring by the methoxy group. Due to the de-activation of benzene ring by the methoxy group. Due to the increase in electron density at ortho and para positions Due to the formation of stable carbocation. 10.Which of the following is not considered a transition element? Scandium Silver Vanadium Zinc 11.Zirconium (Zr, Atomic number 40) and Hafnium (Hf, Atomic number 72) are transition series metals of group 4. They are found together in nature and are difficult to separate from each other. Which of the following is the reason for the above? The almost identical radii of the atoms. The elements belong to the same group. The elements belong to adjacent periods. The presence of the same number of unpaired electrons in both the elements. 12.Which of the following would be among the products of the reactions between ammonia reacts with bromoethane? CH3CH2NH2 (CH3CH2)2NH (CH3CH2)3N (CH3CH2)4N+Br− only i only i and ii only i, ii, and iii all- i, ii, iii and iv 13.Which one of the following is a synthetic halogen compound? a) Chloramphenicol b) Diphenyl hydramine c) Chloroquine d) Omeprazole 14.Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium? a) [Xe] 4f 65d26s2 b) [Xe] 4f75d1 6s2 c) [Xe] 4f86d2 d) [Xe] 4f95s1 15.Alcoholic compounds react: a) only as nucleophiles. b) both as nucleophiles and electrophiles. c) only as electrophiles. d) None of these 16.p – toluenesulphonyl chloride is used to: a) as a replacement of benzenesulphonyl chloride b) All of these c) for the distinction of primary, secondary and tertiary amines d) for the separation of a mixture of amines SECTION B 17.5% solution of Na2SO4.10H2O (MW = 3 22) is isotonic with 2% solution of non- electrolytic, non volatile substance X. Find out the molecular weight of X. 18.Arrange the isomeric dichlorobenzene in the increasing order of their boiling point and melting points. Explain why the electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene. 19.Convert the following: Benzene to m-nitrobenzaldehyde Bromobenzene to benzoic acid 20.Explain the following observations: The transition elements have great tendency for complex formation. There is a gradual decrease in the atomic sizes of transition elements in a series with increasing atomic numbers. 21 define .carbonyl group. SECTION c 22.Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why? Or How do you convert the following? Benzoic acid to benzaldehyde. Ethyne to ethanal. Acetic acid to methane 23.A mixture of 0.5 moles acetaldehyde and 0.5 moles diethyl ketone is treated with 1 mole of sodium cyanide (NaCN). What will be the major product in this reaction? Give two reasons for your answer Or Show steps to convert nitrobenzene to phenol. The table below shows the observation when sodium reacts with ethanol and phenol. Ethanol Solution of phenol in ethanol Sodium sinks, evolves hydrogen steadily Sodium sinks, evolves hydrogen rapidly The reaction in each case involves reduction of hydrogen ion by sodium. Write down an ionic reaction for both the cases. Which is stronger acid- phenol or ethanol? Why? 24.Explain the steps of preparation of potassium dichromate? Or Transition metals generally form coloured ions. Why? Which of the following will be colored? 25.What is the lanthanoid contraction? What are its causes and consequences? 26. A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution. 27.. A compound ‘A’ with molecular formula C4H10O on oxidation forms compound ‘B’ gives positive iodoform test and on reaction with CH3MgBr followed by hydrolysis gives (c). Identify A, B & C. Or Give the equations of reactions for the preparation of phenol from cumene. 28.Chloroform is stored in dark coloured bottles. Section D 29.Read the text carefully and answer the questions: The d-block of the periodic table contains the elements of the groups 3 to 12 and are known as transition elements. In general, the electronic configuration of these elements is (n - 1)d1-10 ns1-2. The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e. 3d, 4d and 5d series. However, Zn, Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation stables, complex formation, formation of coloured ions, alloys, catalytic activity etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point. Why are Zn, Cd and Hg non-transition elements? OR Why are melting points of transition metals high? Which transition metal of 3d series does not show variable oxidation state? Why do transition metals and their compounds show catalytic activity 30.An organic compound ‘A’ having molecular formula C5H10O gives negative Tollens’ test, forms n-pentane on Clemmensen reduction but doesn’t give iodoform test. Identify ‘A’ and give all the reactions involved. Carry out the following conversions: Propanoic acid to 2-Bromopropanoic acid Benzoyl chloride to benzaldehyde How will you distinguish between benzaldehyde and acetaldehyde Section E 31.Write the outer shell electronic configuration of an element with atomic number 24. Why is this different from the elements that are adjacent to it in the periodic table? Why is Hg not considered as a transition element? The third ionisation enthalpy of a few transition elements are given below: Element Sc Ti V Cr Mn Fe Co Ionisation enthalpy (kJ mol-1) 2393 2657 2833 2990 3260 2962 3243Explain the reason for the break in the trend of steady increase in third ionisation enthalpy as shown in the table. Based on this, what can be said about the second ionisation energy of Cr as compared to that of Mn? Or Write the structures of the following organic halogen compounds. (i) 2-Chloro-3-methylpentane (ii) p-Bromochlorobenzene (iii) 1-Chloro-4-ethylcyclohexane (iv) 2-(2-Chlorophenyl)-1-iodooctane (v) Perfluorobenzene (vi) 4-tert-Butyl-3-iodoheptane (vii) 1-Bromo-4-sec-butyl-2-methylbenzene (viii) 1,4-Dibromobut-2-ene 32.The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase. Or write the structures of the following compounds. (i) α-Methoxypropionaldehyde (ii) 3-Hydroxybutanal (iii) 2-Hydroxycyclopentanecarbaldehyde (iv) 4-Oxopentanal (v) Di-sec-butyl ketone (vi) 4-Fluoroacetophenone 33.Write structures of the compounds whose IUPAC names are as follows: (i) 2-Methylbutan-2-ol (ii) 1-Phenylpropan-2-ol (iii) 3,5-Dimethylhexane -1, 3, 5-triol (iv) 2,3 - Diethylphenol (v) 1 - Ethoxypropane (vi) 2-Ethoxy-3-methylpentane (vii) Cyclohexylmethanol (viii) 3-Cyclohexylpentan-3-ol (ix) Cyclopent-3-en-1-ol (x) 3-Chloromethylpentan-1-ol.

    • Posted by Sagar Pandey 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Ashutosh Singh 1 year ago

    Waah beta ! Poora question paper hi chhap diya

    0Thank You

    Ankit Singh 1 year, 1 month ago

    Kya hai ye pura paper hi likh diye ho

    2Thank You

    ANSWER

    • Posted by Govind Lahare 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Amrit Kumar 1 year, 1 month ago

    2>1>3

    1Thank You

    ANSWER

    • Posted by Antra Suthar 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Anand Verma 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Chauhan 10 months, 2 weeks ago

    diamminebis(ethane 1,2- diamine)iron (lll) ion

    0Thank You

    Komal Gola 1 year ago

    Diamminebis (ethane 1,2 diamine) ferrous(III)

    2Thank You

    ANSWER

    • Posted by Keshav Khanduri 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Aditi Bramh 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Charan Teja 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Keshav Chauhan 10 months, 2 weeks ago

    When we move from 3d to 4d and 4d to 5d... The electrons start to be filled in the f subshell. As the screening power of the electrons of the f subshell is very poor, that's why there is regular decrease in the atomic radii of these elements, this is called lanthanoid contraction

    0Thank You

    ANSWER

    • Posted by Krushnakant Nayak 1 year, 1 month ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Chauhan 10 months, 2 weeks ago

    Dry cell is a primary cell. It works as voltaic cell. It is used in clocks, remotes,etc.

    0Thank You

    Aa Zz 1 year, 1 month ago

    Which do not have liquid

    1Thank You

    ANSWER

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