Which of the following compounds has shortest B−F bond length?
A
BF−4
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B
BF3←NH3
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C
BF3
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D
BF3←N(CH3)3
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Solution
The correct option is CBF3 A partial double bond character is developed in B−F bonds of BF3 due to the formation of a pπ backbonds.
In the other cases, B is sp3 hybridized (tetrahedron molecule or ion) and the possibility for π backbonding no longer exists.