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JEE Main levelSingle correct optionDifficulty 2 of 3pb120

Among the boron trihalides, the weakest Lewis acid is

A $BF X_{3}$
B $BCl X_{3}$
C $BBr X_{3}$
D $BI X_{3}$

Answer: A

Effective

2 p π

-

2 p π

back-donation from F into the empty

p

orbital of B reduces its electron deficiency most in

BF X_{3}

, giving the order

BF X_{3} < BCl X_{3} < BBr X_{3} < BI X_{3}

of Lewis acidity.

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