In diborane molecule hydrogen bridge bond is formed because boron has:

shortage of 4 electrons required for bonding

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shortage of 2 electrons required for bonding

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4 electrons more than required for bonding

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2 electrons more than required for bonding.

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Solution

The correct option is C shortage of 2 electrons required for bonding
The bridge bonds are 3c-2e bonds. They have 2 electrons (4 in normal covalent). Thus in diborane boron is short of 2 electrons hence it forms hydrogen bridge.

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