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Question

When BF3 is treated with NH3,

A
Hybridization of N is changed
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B
Hybridization of B is changed
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C
Hybridization of both N and B are changed
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D
Cannot predict
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Solution

The correct option is B Hybridization of B is changed
BF3 +:NH3[F3B:NH3]

Here, the hybridization of N (sp3) is the same before and after the reaction since the steric number is 4 before and after the reaction. But the hybridization of B is changed from sp2 to sp3 because of the increase in the steric number from 3 to 4.

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