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Aldehydes, Ketones and Carboxylic Acids · Question 75

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

In the following reaction product P is R- O \|C-Cl [Pd-BaSO4]H2 P

  1. RCH2OH
  2. RCOOH
  3. RCHO
  4. RCH3

Answer

(3) RCHO

Solution

This is the Rosenmund reduction.

As per NCERT, acyl chlorides are hydrogenated over palladium on barium sulphate to give aldehydes; BaSO4 poisons the catalyst so the aldehyde is not reduced further.

RCOCl + H2 Pd-BaSO4 RCHO + HCl

Answer: (3)

AIPMT 2002

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2002
3

First product of the reaction between RCHO and NH2NH2 is

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

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
5

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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