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

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Correct answer: D. BF _ 3

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

Due to small size atom show strongest back bonding in ${BF}_{3} .<br />In case of$ {BF}_{3} $($ 2P - 2P $back bonding) while in$ {BCl}_{3} ( 2P - 3P ) , {BBr}_{3} ( 2P - 4P ) and {BI}_{3} ( 2P - 5P )back bonding. So extent of back bonding is maximum in \left(2P - 2P\right)

In which one of the following molecules strongest back donation of...

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