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Question

Which of the following is an electron - deficient compound ?

A
NH3
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B
ICl
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C
BCl3
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D
PCl3
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Solution

The correct option is C BCl3
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.

BCl3 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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