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p-Block Elements - I
medium
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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