In a substitution reaction involving an alkane, what happens to the hydrogen atoms of the alkane molecule?
They are replaced by other atoms or groups of atoms.
Alkanes undergo substitution reactions in which a hydrogen atom bonded to a carbon is replaced by another atom or group — most commonly a halogen (Cl, Br) in the presence of light. In the halogenation of methane: CH₄ + Cl₂ → CH₃Cl + HCl.
The hydrogen is not added to the chain (that would be addition), not removed to form double bonds (that would be elimination), and does not react with oxygen (that would be combustion). In substitution, the hydrogen leaves and a new group takes its place.
The correct answer is : They are replaced by other atoms or groups of atoms.
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