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Aldehydes, Ketones and Carboxylic Acids · Question 77

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

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)

AIPMT 2000

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2

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.
AIPMT 2000
3

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.
AIPMT 2000

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