CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

A biomolecule is a chemical compound found in living organisms. These include chemicals that are composed of mainly carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus. Biomolecules are the building blocks of life and perform important functions in living organisms.

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Nishant Pandey 3 years, 9 months ago

Bio -living, molecules - molecule @ a molecule that is produced by living cells and helps them in sustaining their lives on earth.

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ANSWER

Highest dipole moment in which of these 1-CH2CL2 2-CHCL3 3-CCL4

Posted by Mr. Aryaa 3 years, 9 months ago

CBSE > Class 12 > Chemistry

4 answers

Muhammad Abuzar 3 years, 9 months ago

1>2>3

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Sachin Gupta 3 years, 9 months ago

CH2Cl2

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Mr. Aryaa 3 years, 9 months ago

Which 2 or 1

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Tarun Kumar 3 years, 9 months ago

2 one

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ANSWER

Is solid state , chapter 1st of chemistry deleted or not for board ?

Posted by Anita Bishnoi 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Tarun Kumar 3 years, 9 months ago

No only magnetic properties are deleted....

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Mr. Aryaa 3 years, 9 months ago

(Not whole chapter ) only some topics of chapter deleted

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ANSWER

What happens when methyl bromide is treated with sodium in the presence of dry ether?

Posted by Shreya Rajput 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Tarun Kumar 3 years, 9 months ago

Entane +NaBr

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Shweta Denis 3 years, 9 months ago

Ethane +NaBr is formed

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ANSWER

Which gas is harm due to the first world war. The soldiers have to roll their eyes ..

Posted by Ram Asheesh 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Âryãñ Pàñdêy Pandey 3 years, 9 months ago

Amonia

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ANSWER

In the compound of type pox³, p atom show multiple bonding of the type

Posted by Anshul Sharma 3 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

NF3 is weaker ligand than N(CH3)3 why?

Posted by Zahid Anwar 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Anubhav Sharma 3 years, 9 months ago

Because fluorine is much smaller in size and it accepts the electron to complete octate.

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ANSWER

How do you explain the absence of aldehyde group in the pentaacetate of D- glucose?

Posted by Sujata Murmu 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Megha . 3 years, 9 months ago

) Glucose reacts with hydroxylamine to form an oxine where as the penta acetate of glucose does not react with hydroxyl amine indicating the absence of free CHO group.

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Tapan Pandey 3 years, 9 months ago

Padh lo imp h??

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ANSWER

Glucose or socrose are soluble in water but cyclohexane or benzene ( simple six membered ring compound ) are insoluble in water. Explain.

Posted by Sujata Murmu 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Anubhav Sharma 3 years, 9 months ago

Cyclohexane and benzene are insoluble in water because they both are non-polar molecules and they do not form H-bond with water whereas water is highly polar group . Glucose and sucrose are soluble as they form H-bond with water.

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ANSWER

An aromatic compounds A on treatment with CHCl3 and KOH gives two compounds which gave the same product with Zn dust oxidation of B and C with molecular formula C7H6O2 Sodium Salt of gives D which may be obtained by distilling A

Posted by Manish Ghildiyal 3 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

In compounds like N-ethylamine .....what does N stands for

Posted by Drishty Kamboj 3 years, 9 months ago

CBSE > Class 12 > Chemistry

5 answers

Tapan Pandey 3 years, 9 months ago

Jetha bhai ethylamine ka mtlb hi yahi hota h jo aap bata rahe.

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Jetharam Prajapati 3 years, 9 months ago

N stands that ethyl group is attached with amine gro

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Tapan Pandey 3 years, 9 months ago

Oye! Answer:-. In N-ethylamine N stands for normal which means normal ethylamine.

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Tapan Pandey 3 years, 9 months ago

Oye dumbo ......kya bata rha tu ise

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P....... ........ 3 years, 9 months ago

In n-ethylamine compound n is amine group.

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ANSWER

Different between SN1 and SN2 reaction?

Posted by P....... ........ 3 years, 9 months ago

CBSE > Class 12 > Chemistry

5 answers

Tapan Pandey 3 years, 9 months ago

Aur ha miss kya h Mr. Bol

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Tapan Pandey 3 years, 9 months ago

Ha toh N mtlb normal ethylamine h ... N amine ki position represent krta h.

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P....... ........ 3 years, 9 months ago

Miss tp ji hamnee bhi to yahi bataya ki n amine group hai yaa usse amino group bolo aap

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Tapan Pandey 3 years, 9 months ago

Aur ha mechanism padh Lena confirm aati h

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Tapan Pandey 3 years, 9 months ago

In SN1 reaction formation of carbocation or carboanion takes place and in SN2 reaction substitution of anion or cation takes place.

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ANSWER

An element with molar mass 2.7×10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7×103 kg m-3, what is the nature of the cubic unit cell?

Posted by Prisha Rathore 3 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Prisha Rathore 3 years, 9 months ago

Its ok Tapan Pandey

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Tapan Pandey 3 years, 9 months ago

Mennu nii aata?

1Thank You

Nikhil Dwivedi 3 years, 9 months ago

d=ZM/a³Na. Z=da³Na/M. GIVEN,, a=405pm. a=4•05×10_¹⁰ M=2•7×10-² Na=6•023×10²³ d=2•7×10³ SOLUTION 2•7×10³×(4•05×10-¹⁰)³×6•023×10²³/ 2•7×10-² ANSWER=4.oo4.

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ANSWER

Last year question paper with answer

Posted by Pooja Pooja 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Tapan Pandey 3 years, 9 months ago

Because......Mai na type krne wala itna??

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Tapan Pandey 3 years, 9 months ago

See it on doodle

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ANSWER

Topic for project file class:12. Of chemistry.

Posted by Sanghavi Gangwar 3 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Nidhi Kashyap?? 3 years, 8 months ago

U will make project on Sn1, Sn1 reaction , naming rxn , colligative properties , solid state , colloid , or biomolecules etc.

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Prabh Jot 3 years, 9 months ago

Biomolecules

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Tapan Pandey 3 years, 9 months ago

Casin in types of milk is the best one.....

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ANSWER

Why is first ionisation enthalpy of Cu is higher than that of Na?

Posted by Mayur Handique 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Bharti Kaushik 3 years, 9 months ago

Because in case of sodium by losing electron , it acquires nobel gas configuration of neon but in case of copper after losing one electron, Cu achieves only fully filled d orbital. In case of copper nobel gas configuration not acquired. So, in case of sodium we have to provide lesser amount of energy as compared to copper.

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ANSWER

What happened when we iron reaction with Zn

Posted by P....... ........ 3 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Cl2 molecule absorbs a radiation of 200Å to dissociate the bond. Find bond dissociation energy.

Posted by Twinkle . 3 years, 9 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Pentan1ol, ethane,butane,pentanal,ethoxyethane. Arrange in BP increasing.

Posted by Abhay Verma 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Pranay Jaiswal 3 years, 9 months ago

Butane,ethoxyethane,pentanal,pentan1ol

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ANSWER

How gulucose is formed?

Posted by Shyamvi Tyagi 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

R Suseendran 3 years, 9 months ago

By inversion of sucrose (c12h22011) in presence of enzyme Invertase.

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Gurharman Kaur 3 years, 9 months ago

By hydrolysis of starch

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ANSWER

I always get confused in aniline anisole toluene...can anyone help me with any trick?

Posted by Drishty Kamboj 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Ayush Vishwakarma?? 3 years, 9 months ago

Ya.i will help you. don't worry sister... Aniline : agar benzene par NH2(amine) group laga ho toh use Aniline kahenge. Anisole: agar benzene par o-CH3(methoxy) laga ho .. And Toluene: agar benzene par CH3(methyl) laga ho

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P....... ........ 3 years, 9 months ago

Aniline is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine. Anisole-Anisole, or methoxybenzene, is an organic compound with the formula CH3OC6H5. It is a colorless liquid with a smell reminiscent of anise seed, and in fact many of its derivatives are found in natural and artificial fragrances. Toluene- toluene is an aromatic hydrocarbon. It is a colorless, water-insoluble liquid with the smell associated with paint thinners. It is a mono-substituted benzene derivative, consisting of a methyl group (CH₃) attached to a phenyl group.

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ANSWER

Glucosoxime has the formula CHNOH-(CHOH)4-CH2OH...... Why is it not COHNOH-(CHOH)4-CH2OH....Plz clear my doubt

Posted by Drishty Kamboj 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Drishty Kamboj 3 years, 8 months ago

Ek bhi answer nhi ????

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ANSWER

1.Propose the mechanism of the following reaction: CH3-CH2-Br + CH3O-→ CH3-CH2-OCH3 + Br-

Posted by Asha Dey 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Bharti Kaushik 3 years, 9 months ago

Mechanism of reaction follows SN2 mechanism in which methoxide ion attacks from backside and Bromide ions leaves. As a result of which formation of ether takes place

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ANSWER

2) Which one of the following haloalkanes is easily hydrolysed in presence of aqueousKOH. (i)2-methyl-2-iodobutane (ii) 2,2-dimethyl-1-iodopropane Write the major product obtained on hydrolysis 2,2-dimethyl propan-1-ol is treated with HBr.

Posted by Asha Dey 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Bharti Kaushik 3 years, 9 months ago

Hydrolysis of 2- methyl-2-iodobutane takes place easily. Major product of hydrolysis of 2,2-dimethylpropan-1-ol is 2-Bromo-2-methylbutane because in this reaction rearrangement of carbocation takes place.

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ANSWER

Explain: Kolbe's reaction.

Posted by P....... ........ 3 years, 9 months ago

CBSE > Class 12 > Chemistry

3 answers

Gurmeet Kaur 3 years, 9 months ago

Treating with carbon dioxide then with H+ion we get salicylic acid

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Drishty Kamboj 3 years, 9 months ago

First we form phenoxide ion ...then treating this first with carbon dioxide then with H+ we get salicylic acid

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#Srishti ? 3 years, 9 months ago

It is carboxylation chemical reaction that proceeds by heating sodium phenoxide (the sodium salt of phenol) with carbon dioxide under pressure (100 atm, 125 °C), then treating the product with sulfuric acid.

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ANSWER

sample paper chemistry 2021

Posted by Gurjeet Kaur Sandhu 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Drishty Kamboj 3 years, 9 months ago

In*

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Drishty Kamboj 3 years, 9 months ago

Available is this site bro

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ANSWER

When nitrogen gas react with iron at low temperatures and high temperature write difference between these two processes

Posted by Pooja Kumari 3 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Ashutosh Kumar 3 years, 9 months ago

Not satisfied

1Thank You

Nitya Soni 3 years, 9 months ago

At low temperatures nitrogen don't react with iron.

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ANSWER

Give the mechanism of cynohydrin formation when acetaldehyde react with HCN in the presence of NaOH.

Posted by Adithya Deekonda 3 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Omdeep Dagur 3 years, 9 months ago

Base reacts with HCN to form CN− ion. B+HCN→BH++CN− CN− ion acts as nucleophile and attacks carbonyl carbon CN−+R−O∣∣C−R′→R−O−∣C(−R′)−CN The anion thus formed accepts a proton from water to form cyanohydrin. H2O+R−O−∣C(−R′)−CN→R−OH∣C(−R′)−CN+OH

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ANSWER

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