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The tendency of BF(3), BCl(3) and BBr(3)...

The tendency of `BF_(3), BCl_(3)` and `BBr_(3)` behave as Lewis acid decreases in the sequnece

A

`B Br_(3) lt BCl_(3) lt BF_(3)`

B

`BCl_(3) lt BF_(3) lt B Br_(3)`

C

`BF_(3) lt BCl_(3) lt B Br_(3)`

D

`B Br_(3) lt BF_(3) lt BCl_(3)`

Text Solution

Verified by Experts

The correct Answer is:
C
Order of back bonding
`BF_(3) gt BCl_(3) gt B Br_(3)`
Back bonding `2p- 2p " " 2p- 3p " " 2p- 4p` Stronger is the back bonding weaker the tendency to act as a lewis acid
`BF_(3) lt BCl_(3) lt B Br_(3)`
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