JEE Main Chemistry question

Boron halides behave as Lewis acids because of their ......... nature. [BITSAT 2008, AMU 2008, EAMCET 2008]

(A)Proton donor
(B)Covalent
(C)Electron deficientCorrect
(D)Ionising

Answer: (C)

Solution

Boron in has only six electrons around it (an incomplete octet), making it electron-deficient and able to accept a lone pair from a donor molecule — the defining Lewis acid behaviour.

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Question ID VK-138258