First slide

13th group or boron group

Question

In the reaction $LiH + {AlH}_{3} ⟶ {LiAlH}_{4}, {AlH}_{3}$ and LiH act as

Moderate

A

Lewis acid and Lewis base
B

Lewis base and Lewis acid
C

Bronsted base and Bronsted acid
D

None of these

Solution

LiH → Li⁺+ H⁻
AlH₃ + H⁻→ AlH₄⁻
LiH is lone pair donar and AlH₃is lone pair acceptor.
So according to Lewis theory, AlH₃ acts as an acid and LiH acts as a base.

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