Question

Sodium borohydride and lithium aluminum hydride cannot reduce alkenes and alkynes

Answer 1

LiAlH4 is a powerful reducing agent compared to sodium borohydride, NaBH4, since the Al-H bond is weaker and thus less stable than B-H bond. More information: * Lithium aluminium hydride, LiAlH4, also abbreviated as LAH, is a reducing agent commonly employed in modern organic synthesis