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Question

Which of the following bonds has the highest bond energy?

A
CC
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B
CC
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C
C=C
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D
CH
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Solution

The correct option is B CC
Bond energy depends on the bond order i.e., the number of covalent bonds formed between two atoms.
Since, CC has 3 covalent bonds, hence this bond has highest energy. Also, CH bond is stronger than CC bond because of better overlap between carbon and hydrogen (sp3s overlap) in CH as compared to CC bond (sp3sp3 overlap).
Hence, order becomes: CC>C=C>CH>CC.

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