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Question

The electron deficient compound that has 3c - 2e bond among the following:

A
B2H6
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B
Al2Cl6
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C
BeCl2 polymer
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D
All of the above
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Solution

The correct option is A B2H6


In B2H6, total number valence atomic orbitals = 14
(4 from each boron atom and one from each hydrogen atom)
Total number of valence electrons = 12
So in order to utilise all the valence orbitals, B2H6 possess 3c-2e bonds.
In Al2Cl6 and BeCl2 lone pairs are involved in bridge formation. Hence bridge bonds are 3c-4e bonds.

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