Why do the C-C bonds rather than C-H bonds during cracking of alkanes-

Question

Toppr Admin · Accepted Answer

Since the bond dissociation energy of -C-C- bonds -355- kJ- mol-1- is lower than bond dissociation energy of -C-H- bonds -414- kJ- mol-1- therefore during cracking of alkanes- -C-C- bonds break more easily than -C-H- bonds-

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

Since the bond dissociation energy of $$C-C$$ bonds $$(355\ kJ\ mol^{-1})$$ is lower than bond dissociation energy of $$C-H$$ bonds $$(414\ kJ\ mol^{-1})$$, therefore during cracking of alkanes, $$C-C$$ bonds break more easily than $$C-H$$ bonds.