In case of hydrocarbons , the c-c bond is normally safe due to following two reasons :-
- Difference between the electronegativity of Carbon and Hydrogen.
Due to this reason the electrons of the shared pair stays closer to the C-atom which makes it easy to break the C-H bond and release hydrogen as hydronium ion H+ .

2. The carbon atoms in the chain are normally surrounded by H-atoms. Which cause the hindrance and make it easy to attack on C-H bond.
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