Question

Aldehydes on reduction with NaBH4 or LiAlH4 gives?
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Answer 1

Answer:

The reduction of unsymmetrical ketones with LiAlH4 or NaBH4 produces a pair of stereoisomers

The reduction of unsymmetrical ketones with LiAlH4 or NaBH4 produces a pair of stereoisomers because the hydride ion can attack either face of the planar carbonyl group: If no other chiral center are present, the product is a racemic mixture of enantiomers.

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Answer 2

Answer:

Aldehydes produce 1º-alcohols and ketones produce 2º-alcohols. In metal hydrides reductions the resulting alkoxide salts are insoluble and need to be hydrolyzed (with care) before the alcohol product can be isolated. In the sodium borohydride reduction the methanol solvent system achieves this hydrolysis automatically.