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Aldehydes, Ketones and Carboxylic Acids

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2000

First product of the reaction between RCHO and NH2NH2 is

  1. RCH=NNH2
  2. RCH=NH
  3. RCH2NH2
  4. RCON3

Answer

(1) RCH=NNH2

Solution

∵ As per NCERT, aldehydes and ketones react with ammonia derivatives H2N-Z by nucleophilic addition followed by loss of water, forming >C=N-Z.

With hydrazine (Z = NH2) the product is a hydrazone:

RCHO + H2N-NH2 H+ RCH=N-NH2 + H2O

∴ The product is the hydrazone RCH=NNH2.

Answer: (1)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2AIPMT 2000

Benzoic acid may be converted into ethyl benzoate by reaction with :

  1. ethyl alcohol
  2. ethyl alcohol and dry HCl
  3. ethyl chloride
  4. sodium ethoxide.
Ques. 3AIPMT 2000

Reduction by LiAlH4 of hydrolysed product of an ester gives

  1. two alcohols
  2. two aldehydes
  3. one acid and one alcohol
  4. two acids.

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