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 CBCl3
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.
BCl3has 6 valence electrons on B atom and accepts pair of electrons from ammonia to complete its octet. Hence, it is an electron deficient compound.