The tendency of BF _3, BCl _3 and BBr _3 to behave as Lewis acid decreases in the sequence :

NEET 2010 Chemistry question

The tendency of , and to behave as Lewis acid decreases in the sequence :

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

The boron halides are electron deficient (vacant orbital on B). In the small, compact fluorine lone pairs overlap effectively with the vacant orbital of boron (- back bonding), reducing the electron deficiency. This back-donation becomes progressively less effective for

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Question ID VK-090554