Question

Butanol 1 cannot be prepared by reduction of carboxylic acid

Answer 1

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Note that NaBH4 is not strong enough to convert carboxylic acids or esters to alcohols. An aldehyde is produced as an intermediate during this reaction, but it cannot be isolated because it is more reactive than the original carboxylic acid.

For example, butanoic acid can be reduced to butanol when reacted with lithium aluminum hydride as shown below.......

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