Which of the following are used to convert RCHO into `RCH_(2)OH` ?

Options

A. `H_(2)//Pd`
B. `LiAlH_(4)`
C. `NaBH_(4)`
D. Reaction with RMgX followed by hydrolysis

Answer

A, B, C

Explanation

Conversion of aldehyde into alcohol is a reduction reaction. This reduction can be carried out by adding hydrogen in presence of finely deivided metal catalyst such as platinum palladium or nickel.
`RCHO+overset(H_(2)//Pd)rarr RCH_(2)OH`
It can also be prepared by using `NaBH_(4)` and `LiAlH_(4)` as a reducing agent.
`RCHO overset(NaBH_(4))rarr RCH_(2)OH`
`RCHO overset(LiAlH_(4))rarr RCH_(2)OH`
Reaction of RMgX with any aldehyde other than methanal gives secondary alcohols not the primary alcohols.

(Where, `R = -C_(2)H_(5), C_(3)H_(7)` etc.)