The tendency of BF_3,BCl_3 and BBr_3 to behav | vedclass

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Question

(B) The Lewis acid strength of boron trihalides depends on the extent of $p\pi - p\pi$ back bonding from the halogen atom to the boron atom.In $BF_3$,

Vedclass · Accepted Answer

$BBr_3 > BCl_3 > BF_3$

Vedclass · Answer

(B) The Lewis acid strength of boron trihalides depends on the extent of $p\pi - p\pi$ back bonding from the halogen atom to the boron atom.In $BF_3$,the $2p - 2p$ back bonding is most effective due to the small size of the $F$ atom,which significantly reduces the electron deficiency of boron.As the size of the halogen increases from $F$ to $Cl$ to $Br$,the effectiveness of $p\pi - p\pi$ back bonding decreases $(F > Cl > Br)$.Consequently,the electron deficiency on the boron atom increases in the order $BF_3 Therefore,the Lewis acid strength follows the sequence $BBr_3 > BCl_3 > BF_3$.

The tendency of $BF_3$,$BCl_3$ and $BBr_3$ to behave as Lewis acid decreases in the sequence

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