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Aldehydes, Ketones and Carboxylic Acids · Question 72

AIPMT 2003MCQEasy📈 Topic in 12% papers+4−1
1

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

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

Answer

(2) [figure]

Solution

m-Chlorobenzaldehyde has no α-hydrogen with concentrated (50%) alkali it undergoes the Cannizzaro reaction (self oxidation–reduction).

2 ClC6H4CHO + KOH ClC6H4COO-K+ + ClC6H4CH2OH

One molecule is oxidised to m-chlorobenzoate and the other is reduced to m-chlorobenzyl alcohol.

The C–Cl bond of the ring is not attacked by the alkali under these conditions, so Cl stays in the meta position.

Answer: (2)

AIPMT 2003

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

A and B in the following reactions are : [figure]

  1. [figure]
  2. [figure]
  3. A = RR'CHCN, B = NaOH
  4. [figure]
AIPMT 2003
3

[figure] In the above reaction product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. C6H5- O \|C-C6H5
AIPMT 2002
4

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

  1. RCH2OH
  2. RCOOH
  3. RCHO
  4. RCH3
AIPMT 2002
5

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2002
6

First product of the reaction between RCHO and NH2NH2 is

  1. RCH=NNH2
  2. RCH=NH
  3. RCH2NH2
  4. RCON3
AIPMT 2000
7

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
8

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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