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Question

Chemistry Question on p -Block Elements

Boron halides behave as Lewis acids because they

A

are covalent compounds

B

are ionic compounds

C

have only six electrons in the valence shell

D

have a lone pair of electrons on the B atom

Answer

have only six electrons in the valence shell

Explanation

Solution

Boron halides, BX3BX_3 have only six electrons (three from B atom and three from three halogen atoms) around central B atom and thus B octet is not complete. Hence, boron halides behave as electron deficient compounds or Lewis acids.