JEE Main Chemistry question

The relative Lewis acid character of boron trihalides is in the order [AMU 2004]

(A)BI_3 > BBr_3 > BF_3 > BCl_3
(B)BI_3 > BBr_3 > BCl_3 > BF_3Correct
(C)BF_3 > BCl_3 > BBr_3 > BI_3
(D)BCl_3 > BF_3 > BI_3 > BBr_3

Answer: (B)

Solution

As halogen size increases from F to I, – back-donation into boron's empty orbital weakens (poorer orbital overlap), so the boron centre becomes progressively more

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Question ID VK-138215