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The Lewis acid character of boron trihal...

The Lewis acid character of boron trihalides decreases as: `B Br_(3) gt BCl_(3) gt BF_(3)`. Explain ?

A

`BBr_(3)ltBCl_(3)ltBF_(3)`

B

`BCl_(3)ltBF_(3)ltBBr_(3)`

C

`BF_(3)ltBCl_(3)ltBBr_(3)`

D

`BBr_(3)ltBF_(3)ltBCl_(3)`

Text Solution

Verified by Experts

The correct Answer is:
C
Lewis acid strength of `BBr_(3), BCl_(3) and BF_(3)` is in the order
`BF_(3)ltBCl_(3)ltBBr_(3)`
Due to back bonding
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Statement: Acidic nature of boron trihalides is in the order BF_(3)ltBCI_(3)ltBBr_(3)ltBI_(3) . Explanation: Basic nature of nitrogen trihalides is in the order NF_(3)gtNCI_(3)gtNBr_(3)gtNI_(3) .

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BCl_(3) exists but BH_(3) does not. Explain.

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The decreasing trend of acidic nature of trihalides of boron is: