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Q. LiAlH4 and NaBH4 both reduce carboxylic acids / ketones, but only LiAlH4 reduces a nitro group? Why doesn't NaBH4 reduce the Nitro group?

Ans.the first one is probably about the improved reactivity of lithium over sodium. Lithium loves oxygen more than sodium does; this is because nitro groups can be reduced with lithium aluminum hydride; you know that slightly basic sodium borohydride in alcohol or water is used for reduction; lithium aluminium hydride is not. That may be why the different reactivities are.

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