CBSE Class 12 Chemistry Chapter 12 Important Questions – Free PDF Download
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Important Questions Class 12 Chemistry Chapter 12 – Aldehydes Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Important Questions Chapter 12 – Aldehydes Ketones and Carboxylic Acids
1 Mark Questions
1. Give one use of Formalin.
Ans. Formalin is used as a disinfectant, preservative for biological specimens and in leather industry.
2. What is the chemical name of Tollen’s reagent and Fehling’s solution.
Ans. Tollen’s reagent = Ammoniacal Silver Nitrate
Fehlings solution = Sodium Potassium Tartarate.
3. Write the structure of alkenes that on ozonolysis will give ketone only.
Ans.
4. What is the function of 
in rosenmund reaction?
Ans. acts as a catalytic poison which prevents further reduction of aldehyde to alcohol.
5. Name the isomers with molecular formula
. Which one will have high boiling point?
Ans. The two isomers are 
and
. Acetone boils at higher temperature due to presence of two electron donating alkyl groups.
6. Write a chemical test to distinguish between aldehyde and ketone.
Ans. Aldehydes and ketones can be distinguished by Tollen’s test. Aldehydes give a silver mirror on reacting with Tollen’s reagent whereas ketones will not react.
7. What happens when acetaldehyde is kept with a trace of sulphuric acid? Write the structure of product.
Ans. A trimer of acetaldehyde, called paraldchyde is formed.
8. What is the Hofmann bromamide reaction? Illustrate with one example.
Ans. Hoffman bromamide reaction is a reaction in which amides are converted to amines of one carbon less than the starting amide. It is a very important step – down reaction.
9. Give IUPAC names of following
(i)
(ii)
(iii)
(iv)
(v) 
(vi)
(vii)
(viii)
(ix) HOOC – CH = CH – COOH
(x)
Ans. (i). 5-Chloro -3- ethylpentan -2-one.
(ii). 2 –(2-bromophenyl) ethanal
(iii). 2- Phenylpropanal
(iv). 5- Chloro -3- methyl pentan -2-one
(v). 4- Hydroxypentan -2- one
(vi). 3- Methylbutan -2-one
(vii). 2- Ethyl -2- methylbutanoic acid
(viii). 2- (3- Bromophenyl) ethanal
(ix). But-2- en -1,4 –dioic acid
(x). 4- Methoxybenzaldehyde
10. Draw the structure of the following –
(i) 4- Methoxybenzaldehyde
(ii) 5- Bromo -3- Chloro -2- iodobenzoic acid
(iii) 3,3 – Dimethyl -1- Chlorobutane
(iv) 2,3- Dihydroxy -4-methylpentanal
(v) 3- Hydroxy-2-methyl -propanal
(vi) 2,4 –Dimethyl -3- pentanone
(vii) 1,2 –Ethaneodioc acid
(viii) 3- Pentene -2-one
(ix) 1,3 – Propane –dioic acid
Ans. (i).
(ii).
(iii).
(iv).
(v).
(vi).
(vii).
(viii).
(ix).
