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Question
Arrange the following bonds according to their average bond energies in descending order:
C−Cl, C−Br, C−F, C−I
Arrange the following bonds according to their average bond energies in descending order:
C−Cl, C−Br, C−F, C−I
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Solution
The correct option is D C−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 overlappings involved are 2p−4p and 2p−5p respectively. The bond length for the various type of overlappings can be given as:
2p−2p<2p−3p<2p−4p<2p−5p.
As we know that Bond energy α 1Bond length
The order of bond energy comes out: C−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 overlappings involved are 2p−4p and 2p−5p respectively. The bond length for the various type of overlappings can be given as:
2p−2p<2p−3p<2p−4p<2p−5p.
As we know that Bond energy α 1Bond length
The order of bond energy comes out: C−F>C−Cl>C−Br>C−I
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