In which one of the following molecules is th | vedclass

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(B) Back bonding in boron trihalides involves the donation of a lone pair from the halide $p$-orbital to the empty $2p$-orbital of boron.This is a $(p

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$BF_{3}$

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(B) Back bonding in boron trihalides involves the donation of a lone pair from the halide $p$-orbital to the empty $2p$-orbital of boron.This is a $(p\pi-p\pi)$ back bonding.The strength of back bonding depends on the effective overlap between the orbitals.For $BF_{3}$,the overlap is $(2p\pi-2p\pi)$,which is the most effective due to similar size.For $BCl_{3}$,it is $(2p\pi-3p\pi)$,for $BBr_{3}$ it is $(2p\pi-4p\pi)$,and for $BI_{3}$ it is $(2p\pi-5p\pi)$.As the size of the halide increases,the energy gap increases and the overlap efficiency decreases.Therefore,the order of back bonding strength is $BF_{3} > BCl_{3} > BBr_{3} > BI_{3}$.

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

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