Why do the C-C bonds rather than the C-H bonds break during pyrolysis of alkanes ?

During pyrolysis C-C bond break first because bond energy of C-C bond is lower than the bond energy of C-H bond. The C-C bond energy is 83.0 kcals while C-H bond energy is 98.8 kcals. Thus, C-C bond break more easily than C-H bonds.

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