Which of the following is an electron - deficient compound ?

N H_{3}

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I C l

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B C l_{3}

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P C l_{3}

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Solution

The correct option is C $B C l_{3}$
In electron deficient compounds, the central atom either does not have eight electrons in the valence shell or it has eight electrons but can expand its valence beyond 4 due to presence of vacant d orbitals.

$B C l_{3}$ has 6 valence electrons on B atom and accepts pair of electrons from ammonia to complete its octet. Hence, it is an electron deficient compound.

Hence, the correct option is $C$

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