Question
Explain reduction reaction of carboxylic acids.
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Answer
→ Carboxylic acids are reduced to primary alcohols by lithium aluminium hydride or better with diborane. Diborane does not easily reduce functional groups such as ester, nitro, halo, etc. Sodium borohydride does not reduce the carboxyl group.
$R - COOH \xrightarrow[\text { (ii) } H _3 O ^{+}]{\text {(i) } LiAIH _4 / \text { ether } B _2 H _6} R - CH _2 OH$
$R - COOH \xrightarrow[\text { (ii) } H _3 O ^{+}]{\text {(i) } LiAIH _4 / \text { ether } B _2 H _6} R - CH _2 OH$
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