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Question

The sigma bond energy of C-H bond in C2H6 is:

A
99 kcal
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B
140 kcal
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C
200 kcal
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D
60 kcal
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Solution

The correct option is A 99 kcal
Sigma bond is the first bond formed between any two atoms. Sigma bond energy is the amount of energy required to break the CH bond. In C2H6 the bond energy is the average value of all the bond dissociation energy. If the bond energy increases the stability of the bond increases but its reactivity decreases. Bond energy is expressed at room temperature.
The CH bond energy in C2H6 is 99 kcal or 413 KJ/mol.

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