Among the halides (a) BF(3) (b) ...

Among the halides
(a) `BF_(3)`
(b) `BCl_(3)`
(c ) `BBr_(3)`
(d) `BI_(3)`
The order of decreasing Lewis acid character is

A

a,b,c,d

B

d,c,b,a

C

c,d,b,a

D

b,c,d,a

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The correct Answer is:

B

Order of Lewis acid character `BI_(2) gt "BBr"_3 gt BCI_(3) gt BF_3`
due to ` p pi - p pi` back bonding

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