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Question

The bond length in hypothetical molecules A2, B2, C2 and D2 are given. Which of the following will have lowest bond enthalpy?


A

D-D = 267 pm

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B

C-C = 228 pm

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C

A-A = 74 pm

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D

B-B = 144 pm

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Solution

The correct option is A

D-D = 267 pm


With increase in bond enthalpy, bond length decreases.

Thus the molecule with largest bond length will have lowest bond enthalpy.


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