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The Lewis acidity of BF3 is less than BC...

The Lewis acidity of `BF_3` is less than `BCl_3` even though fluorine is more electronegative than chlorine. It is due to

A

Stronger `2p(B) - 2p(F) sigma` - bonding

B

Stronger `2p(B) - 2p(F) pi` - bonding

C

Stronger `1p(B) - 3p(Cl) sigma` - bonding

D

Stronger `2p(B) - 3p (CL) pi` - bonding

Text Solution

Verified by Experts

The correct Answer is:
B
Stronger `2pB) - 2p(F) pi` - bonding
`pi p - pi p` back bonding

Size of Cl is more than the size of F so in case of `BF_3` strong `1p(B) - 2p(F)pi`-bonding occurs so lewis acidity of `BF_3` is less than `BCl_3`.
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