Which of the following is electron-deficient?

(C H_{3})_{2}

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(S i H_{3})_{2}

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(B H_{3})_{2}

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P H_{3}

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Solution

The correct option is B $(B H_{3})_{2}$
Diborane $(B H_{3})_{2}$ is an electron deficient species.
It contains less number of electrons than required for bonding.
In diborane, 14 electrons are required to form 7 bonds however only 12 electrons are present.

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