Arrange the following bonds according to their average bond energies in descending order: C−Cl,C−Br,C−F,C−I
A
C−Cl>C−Br>C−I>C−F
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B
C−Br>C−I>C−Cl>C−F
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C
C−I>−Br>C−Cl>C−F
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D
C−F>C−Cl>C−Br>C−I
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Solution
The correct option is DC−F>C−Cl>C−Br>C−I In C−F there is 2p−2p overlapping involved, in C−Cl the overlapping involved is 2p−3p whereas for C−Br and C−I the overlapping involved are 2p−4p and 2p−5p respectively. The bond length for the various type of overlapping can be given as; 2p−2p<2p−3p<2p−4p<2p−5p