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Question

Look at the following reaction:
LiH+AlH3LiAlH4

Here AlH3 and LiH act as:


A

Lewis acid and Lewis base

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B

Lewis base and Lewis acid

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C

Bronsted base and Bronsted acid

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D

None of these

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Solution

The correct option is A

Lewis acid and Lewis base



As shown in the figure, the central metal atom in AlH3 has only six valence electrons. Hence, it could accept a pair of electrons (Lewis acid) to complete its octet. On the other hand, H is a Lewis base because it has two valence electrons thus having a completely filled shell. Further, since the ion readily shares or donates electrons - it acts as a Lewis base.


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