Ncert Exercises & Solutions

Reagents used to convert RCHO into RCH₂OH among the following are:

(a) H₂ /Pd or Pt

(b) LiAIH₄

(d) Reaction with RMgx followed by hydrolysis

1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)

Conversion of aldehyde into alcohol is a reduction reaction. This reduction can be carried out by adding hydrogen in presence of finely divided metal catalyst such as platinum, palladium or nickel.
$RCHO + \overset{H_{2} / Pd}{\to} {RCH}_{2} OH$

It can also be prepared by using ${NaBH}_{4}$ and ${LiAlH}_{4}$ as a reducing agent.

$RCHO \overset{{NaBH}_{4}}{\to} {RCH}_{2} OH$
$RCHO \overset{{LiAlH}_{4}}{\to} {RCH}_{2} OH$

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.)

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