Which of the following halides of group 13 el | vedclass

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(D) The Lewis acidity of boron trihalides depends on the extent of back-bonding between the lone pair of the halogen and the empty $p$-orbital of boro

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$BBr_3$

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(D) The Lewis acidity of boron trihalides depends on the extent of back-bonding between the lone pair of the halogen and the empty $p$-orbital of boron. Back-bonding is most effective in $BF_3$ due to the small size of the $F$ atom ($2p-2p$ overlap),which reduces the electron deficiency of boron. As the size of the halogen increases from $F$ to $I$,the effectiveness of back-bonding decreases ($2p-3p$ for $BCl_3$,$2p-4p$ for $BBr_3$). Therefore,the Lewis acidity increases in the order: $BF_3 Thus,$BBr_3$ is more acidic than $BF_3$ and $BCl_3$.

Which of the following halides of group $13$ elements is the most acidic?

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