MHT CET 2022 Chemistry question

Which among the following molecules has lowest bond dissociation enthalpy?

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

The bond dissociation enthalpies of the halogen molecules are: = 158.8, = 242.6, = 192.8, = 151.1 kJ/mol. Down the group the bond length increases ( is the longest) and the overlap of the larger orbitals becomes poorer, so the bond gets weaker from to . is an

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Question ID VK-094000