Question

8.
CH
The following conversion
R.
R
H
C=O -
R
R H
cannot be effected by
(1) Clemmensen reduction
(2) Wolff-Kishner reduction
(3) Wurtz reaction
(4) Red P and HI at 200°C​

Answer 1

Wrutz Reaction

Explanation:

Conversion involves Reduction which is not possible by the wrutz reaction

Answer 2

Clemmensen's reduction, Wolf-Kishner reduction and Red Phosphorus in HI are the reactions used as to replace "carbonyl group" with hydrogens,

where as wurtz reaction is a simple coupling reaction which takes place when alkyl halides are treated with Na in dry ether and gives symmetrical alkanes.

So, Wurtz reaction cannot be used for the given conversion as it takes place only in alkyl halides.

So, if your question was which of the following cannot be used to perform the above conversion, then it is 'Wurtz reaction'

as all other options namely, Clemmensen's reduction, Wolf-Kishner reduction and Red Phosphorus in HI are commonly used for such type of conversions.

Hope it helps!!