No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

    • Posted by Monalisa Jena 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Avinaw Bhardwaj 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    Aldehydes are more reactive than ketones towards nucleophilic addition reactions due to the following factors:
    1. Aldehydes are less sterically hindered as compared to ketones.
    2. Aldehydes are more reactive as compared to ketones due to factors like hyperconjugation.
    3. Carbonyl group in an aldehyde is more polar than the carbonyl group of ketones.

    1Thank You

    ANSWER

    • Posted by S M 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Gaurav Seth 7 years ago

    1) Preparation of Phenols from Haloarenes

    Chlorobenzene is an example of haloarenes. We can obtain chlorobenzene by the monosubstitution of a benzene ring. When chlorobenzene fuses with sodium hydroxide at 623K and 320 atm, we obtain sodium phenoxide. Finally, sodium phenoxide on acidification gives phenols.

    2) Preparation of Phenols from Benzene Sulphonic Acid

    We can obtain Benzenesulphonic from benzene by reacting it with oleum. Benzenesulphonic acid, thus formed, is treated with molten sodium hydroxide at high temperature. This process leads to the formation of sodium phenoxide. Finally, sodium phenoxide on acidification gives phenols.

    3) Preparation of Phenols from Diazonium Salts

    When we treat an aromatic primary amine with nitrous (NaNO2 + HCl) acid at 273 – 278 K, we can easily obtain diazonium salts. These diazonium salts are highly reactive in nature. Upon warming with water, these diazonium salts finally hydrolyse to phenols. We can also obtain phenols from diazonium salts by treating it with dilute acids.

    4) Preparation of Phenols from Cumene

    Cumene is an organic compound that we can obtain by the Friedel-Crafts alkylation of benzene with propylene. Upon oxidation of cumene (isopropylbenzene) in presence of air, we obtain cumene hydroperoxide.

    Upon further treatment of cumene hydroperoxide with dilute acid, we get the phenols. We also produce acetone as one of the by-products of this reaction in large quantities. Hence, phenols prepared by these methods need purifications.

    0Thank You

    S M 7 years ago

    Best method

    2Thank You

    ANSWER

    • Posted by Nitika Neb 5 years, 8 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Nitika Neb 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Shubham Taneja 7 years ago

    Depressant is used to seperate two sulphide ores. For eg. If we take zns and pbs depressant will be NACN then it prevents zns from coming froth but allows pbs to come with froath.

    2Thank You

    ANSWER

    • Posted by Nitika Neb 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Tarun Gulia 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Navya Singh 7 years ago

    Ncert is best for organic ..just do it by understanding reactions nd name rxns are most important

    2Thank You

    Mansi Sharma 7 years ago

    First of all u should learn all the name rxn's and others nd all the concepts in ncert book . Then all the conversions ,distinguishes .......u should very well known about that . These will perfectly Increase ur marks in organic .

    2Thank You

    ANSWER

    • Posted by Mansi Sharma 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Mansi Sharma 7 years ago

    IUPAC of coordination is much easier then organic

    0Thank You

    Hritik Jha 7 years ago

    Follow some basic rule and for sure you would be able to name them just you have to stydy the types of it

    0Thank You

    ANSWER

    • Posted by Saurav Verma 7 years ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Ashish Soni 7 years ago

    Because their physical property like temperature, refractive index e.t.c are different in different direction.

    0Thank You

    Divanshi Bhardwaj 7 years ago

    They are anisotropic because some of the property like refrective index have different value for different direction Shortcut to learn ( D.D for crystaline and for anisotropic same value for different direction S.D )

    1Thank You

    Navya Singh 7 years ago

    Because they show different physical properties like refractive index etc. in different directions

    1Thank You

    ANSWER

    • Posted by Asheesh Yadav 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    Nitrogen is inert molecule because in nitrogen there exist a triple bond betwwn the two nitrogen atoms.
    This triple bond constituted of one sigma and two pi bonds i.e.
    Px - Px  overlap to form sigma bond.
    Py-Py and Pz - Pz  overlaps to form pi bond.
    The intermolecular forces in this are weak Van der Walls forces. So, the diatomic molecules exist freely.Because of the triple bond,the bond energy is very high.The bond dissociation energy of nitrogen is 945.4 kJ/mol.Due to this high bond dissociation energy, nitrogen is apparently inactive under normal conditions.This is why nitrogen is unreactive gas.

    1Thank You

    ANSWER

    • Posted by Harshit Pratap Singh 7 years ago

    CBSE > Class 12 > Chemistry
    • 5 answers

    Mansi Sharma 7 years ago

    Arihant chapterwise are the best my di also scored very well with it and i am also preffrring it it have variety of questions that can be arised from any chapter i really suggest that u should go through arihant ....best book

    1Thank You

    Navya Singh 7 years ago

    You can prefer xam idea or oswal sample paper

    1Thank You

    Saumya Agrawal 7 years ago

    I mean 5 year question papers ...

    0Thank You

    Saumya Agrawal 7 years ago

    What i believe is that first you must complete ncert solutions with full attention and after that you should solve 5 years sample papers and after that any book you can use okkk......

    1Thank You

    Rajat Dhull 7 years ago

    Each book is good follow anyone but read completly.

    0Thank You

    ANSWER

    • Posted by Ujjwal Dhaniya 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aryan Rai 7 years ago

    dicyanidosilver (||)

    0Thank You

    Asheesh Yadav 7 years ago

    Diaminesilver

    0Thank You

    ANSWER

    • Posted by Garima Chauhan 7 years ago

    CBSE > Class 12 > Chemistry
    • 5 answers

    Garima Chauhan 7 years ago

    Ok thanks

    0Thank You

    Aryan Rai 7 years ago

    Hope this will be helpful to you too :)

    0Thank You

    Aryan Rai 7 years ago

    I had done OSWAAL SOLVED PAPERS in class 10 and I'm going with it also in class 12. I think OSWAAL SOLVED PAPERS is better than CBSE 15 SAMPLE QUESTION PAPERS.

    0Thank You

    Garima Chauhan 7 years ago

    Hey Tell me which u prefer

    1Thank You

    Aryan Rai 7 years ago

    Hey.. There are two types of books available in market of OSWAAL. One is OSWAAL SOLVED PAPERS where you get the notes of every chapter and at end of every chapter there is a lot of questions for practice along with marking schemes issued by the board. The questions consist of a set of levels like Level-1,2 and HOTS. Also it is mentioned that when was that particular question asked in the board. And the other one is CBSE 15 SAMPLE QUESTION PAPERS it is also from OSWAAL. But in that only samples paper are given along with a short note on every chapter and the hints to the questions are also given. So choose what you want form these two.

    2Thank You

    ANSWER

    • Posted by Abhishek Yadav 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aryan Rai 7 years ago

    I mean 2.5m and you should write the formula correctly. It's not Noah, it's NaOH

    0Thank You

    Aryan Rai 7 years ago

    2.5M

    0Thank You

    ANSWER

    • Posted by Rajit Sharma 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Manan Bedi 7 years ago

    Bcoz oxygen is more soluble in cold water

    2Thank You

    ANSWER

    • Posted by Shivanand Babu 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Yogita Ingle 7 years ago

    When dehydration of ethanol is carried out at a higher temperature (443 K), ethene is formed. The following chemical reaction takes place.

    2Thank You

    Gaurav Seth 7 years ago

    When dehydration of ethanol is carried out at a higher temperature (443 K), ethene is formed. The following chemical reaction takes place.

    1Thank You

    ANSWER

    • Posted by Pulkit Tomar 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    • Take a unit cell of ccp or fcc lattice divide into eight small cubes with each small cube having atoms at alternate corners.
    • Thus, each small cube has 4 atoms that on joining to each other make a regular tetrahedron.
    • Thus, there is one tetrahedral void in each small cube and eight tetrahedral voids in total.
    • Each of the eight small cubes have one void in one unit cell of ccp
    • ccp structure has 4 atoms per unit cell. Thus, the number of tetrahedral voids is twice the number of atoms.

    0Thank You

    ANSWER

    • Posted by Batul Ali Bohra 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Yogita Ingle 7 years ago

    Dow's process is the method of formation of phenol from chlorobenzene, by treating chlorobenzene with Sodium hydroxide at 673 K.

    2Thank You

    Priyanka Singh 7 years ago

    Chloro benzene +NaOH -----> sodium phenoxide (benzene with ONa in 1st position) --------> phenol

    0Thank You

    ANSWER

    • Posted by Vipin Gautam 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Priyanka Singh 7 years ago

    Because alcohol is less polar than water

    0Thank You

    ANSWER

    • Posted by Manoj Boura 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Ayush Katiyar 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Krishna Garg 7 years ago

    These are the compounds in which the halogen atom is bonded to a sp3-hybridised carbon atom next to an aromatic ring . Ex.Toluene.☺

    1Thank You

    ANSWER

    • Posted by Ashu Patel 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Sharul Sharma 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Aman Raj 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Sãñjü Dïdêl 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Arti Vishwakarma 7 years ago

    trigonal bipyramidal

    3Thank You

    ANSWER

    • Posted by Sãñjü Dïdêl 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Gautam Mali 7 years ago

    Two complementary metal ions were used to enhance the performance of electrode materials. The specific capacitance of the electroactive materials was continuously improved by increasing the nickel ion content, and the electric conductivity was also enhanced when the cobalt ion was varied

    2Thank You

    ANSWER

    • Posted by Saba Parvez 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Priyanka Singh 7 years ago

    The mechanism of electrophillic substitution of aryl halides goes in accordance to SN1 reaction,there is a foramation of cabocation which gets stabilised through resonance.

    0Thank You

    ANSWER

    • Posted by Mohit Yadav 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Deepak Meena 7 years ago

    CBSE > Class 12 > Chemistry
    • 4 answers

    Priyanka Singh 7 years ago

    Asprin is an blood dilutor,it dilutes the blood and makes it thinner to reduce the stress on hreat arteries and makes it easier for the heart to pump blood

    0Thank You

    Muskan Thakur 7 years ago

    asprin is the type of drug which makes the blood thick so that it can easily circulate in our body which helps to prevent heart attacks

    0Thank You

    Manish Yadav 7 years ago

    Asprin makes the blood thick i.e. blood can eaisly pass through blocked nerves which help in preventing heart attack

    0Thank You

    Yogita Ingle 7 years ago

    When we have a heart attack, it's because one of the coronary arteries (which provide blood to the heart, has developed a clot that obstructs the flow of blood and oxygen to the heart. Aspirin works by interfering with your blood's clotting action and it helps in thinning of blood.

    0Thank You

    ANSWER

    • Posted by Alok Shrivastava 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aryan Rai 7 years ago

    Due to which all the Lanthanoid elements show similar chemical property and it becomes difficult to distinguish b/w them.

    0Thank You

    Anand Satyarthi 7 years ago

    When we going on the right side in the lanthniod 14 group element atomic and ionic radii decreases with atomic number increase it phenomena called lanthniod construction

    0Thank You

    ANSWER

    myCBSEguide App

    myCBSEguide

    Trusted by 1 Crore+ Students

    Install Now

    Test Generator

    Test Generator

    Create papers online. It's FREE.

    Try Now

    CUET Mock Tests

    CUET Mock Tests

    75,000+ questions to practice only on myCBSEguide app

    Install Now
    Google Play

    Download myCBSEguide App

    All Courses

    Other Websites

    CBSE Courses

    Resources

    Corporate

    NCERT Solutions

    CBSE Sample Papers

    All Content and Intellectual Property is under Copyright Protection | myCBSEguide.com ©2007-2026