In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

B B r_{3}

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B C l_{3}

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B I_{3}

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B F_{3}

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Solution

The correct option is D $B F_{3}$
Among the given boron trihalides, the extent of back donation is maximum in $B F_{3}$ due to smaller size of $F -$ atom.

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