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Aldehydes, Ketones and Carboxylic Acids · Question 76

AIPMT 2002MCQMedium📈 Topic in 50% papers+4−1
1

[figure] Product 'P' in the above reaction is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(2) [figure]

Solution

As per NCERT, nitriles react with Grignard reagents to give an imine salt, which on hydrolysis gives a ketone.

Ar-C N + CH3MgBr Ar- NMgBr \|C-CH3

Ar- NMgBr \|C-CH3 H3O+ Ar- O \|C-CH3

(Ar = 3-methoxyphenyl; the -OCH3 group is not affected.)

∴ P is 1-(3-methoxyphenyl)ethan-1-one, the structure in option (2).

Answer: (2)

AIPMT 2002

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

First product of the reaction between RCHO and NH2NH2 is

  1. RCH=NNH2
  2. RCH=NH
  3. RCH2NH2
  4. RCON3
AIPMT 2000
3

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
4

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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