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NaBH4 or LiAlH4 v/s NaH….base or reducing agent

Both NaH and NaBH4 (Or LiAlH4) furnish H- but when reacted with aldehyde (Or ketone) NaH acts as a base and abstracts alpha hydrogen forming an enolate ion whereas NaBH4 acts as a reducing agent and reduces the carbonyl group to alcohol.

Also, R- from grignard reagent (RMgBr) and gilmann’s reagent (R2CuLi) although being a strong base reduces the carbonyl group and does not act as a base.

I’m unable to think of a reason, nor I could find it on the net.

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