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Hydrocarbons — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
Question
Why do the C-C bonds rather than C-H bonds break during cracking of alkanes?
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Answer

Since the bond dissociation energy of C-C bonds (348kJ mol-1) is lower than bond dissociation energy of C-H bonds (414kJ mol-1), therefore, during cracking of alkanes, C-C bonds break more easily than C-H bonds.

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