The strongest Lewis acid is –
(a) BF₃
(b) BCl₃
(c) BBr₃
(d) BI₃
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The strongest Lewis acid is BI3
The expected order is:
BF3>BCl3>BBr3>BI3
But due to BACK BONDING the order reverses to:
BF3<BCl3<BBr3<BI3
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