Tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in sequence

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p-Block Elements - I

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

A

$BCl_3 > BF_3 > BBr_3$

B

$BBr_3 > BCl_3 > BF_3$

C

$BBr_3 > BF_3 > BCl_3$

D

$BF_3 > BCl_3 > BBr_3$

(AIPMT-2010)

Solution

As the extent of $p \pi-p \pi$ back bonding decreases, electron-deficiency increases and hence the Lewis acid strength increases.

Standard 11

Chemistry

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