HARDMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Achiever Section

Assertion : BF₃ is a weaker Lewis acid than BCl₃. Reason : BF₃ molecule is stabilized to a greater extent than BCl₃ by B—F p-bonding.

A.A✓ Correct

B.B

C.C

D.D

Explanation

pp -pp back bonding in BF₃ molecule there is (2p-2p) overlap resulting in stronger (pp -pp ) back bonding Whereas in BCl₃ there is (2p-3p) overlap resultig in less stronger (pp -pp )back bonding as in BF₃ the vacant p-orbitals of B-atom interacts with lone pair of F-atom Therefore lp's availability is reduced making BF₃ a weaker base than BCl₃

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