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  4. The C-H bond energy in ethane, ethene and ethyne:

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Q. The $ C-H $ bond energy in ethane, ethene and ethyne:

Rajasthan PMTRajasthan PMT 1999

Solution:

$ H-\underset{|}{\mathop{\overset{|}{\mathop{C}}\,}}\,-<=\overset{|}{\mathop{C}}\,-H<\equiv C-H $ Bond energy $ 411~~~~~444.14~\,\,\,\,\,\,506.99\text{ }J $ . $ mol{{e}^{-1}} $ So the $ C-H $ bond energy is more in ethyne