Write a note on the preparation of primary alcohol from aldehyde by reduction reaction.
(N/A) Aldehydes are reduced to primary alcohols by using reducing agents like sodium borohydride $(NaBH_4)$ or lithium aluminium hydride $(LiAlH_4)$,as well as by catalytic hydrogenation.
General reaction:
$RCHO + 2[H] \xrightarrow{NaBH_4 / LiAlH_4 / (Pd/H_2)} RCH_2OH$
Example:
$(i) CH_3CHO + 2[H] \xrightarrow{NaBH_4 / LiAlH_4 / (Pd/H_2)} CH_3CH_2OH$
$(\text{Ethanal}) \qquad (\text{Ethanol})$
General reaction:
$RCHO + 2[H] \xrightarrow{NaBH_4 / LiAlH_4 / (Pd/H_2)} RCH_2OH$
Example:
$(i) CH_3CHO + 2[H] \xrightarrow{NaBH_4 / LiAlH_4 / (Pd/H_2)} CH_3CH_2OH$
$(\text{Ethanal}) \qquad (\text{Ethanol})$
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