Halogenation of alkanes is an example of

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(C) The halogenation of alkanes is a chain reaction that proceeds via a free-radical mechanism in the presence of sunlight $(h
u)$ or heat.The reacti

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Free-radical substitution

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(C) The halogenation of alkanes is a chain reaction that proceeds via a free-radical mechanism in the presence of sunlight $(h
u)$ or heat.The reaction involves three steps:$1$. Initiation: The halogen molecule $(X_2)$ undergoes homolytic fission to form halogen radicals $(X\cdot)$.$2$. Propagation: The halogen radical abstracts a hydrogen atom from the alkane $(R-H)$ to form an alkyl radical $(R\cdot)$ and $HX$. The alkyl radical then reacts with another halogen molecule to form the alkyl halide $(R-X)$ and regenerates a halogen radical.$3$. Termination: The reaction stops when two radicals combine to form a stable molecule.Since the reaction proceeds through the formation of free radicals,it is classified as a free-radical substitution reaction.The reaction sequence is as follows:$CH_4 + Cl_2 ightarrow CH_3Cl + HCl$ (chloromethane)$CH_3Cl + Cl_2 ightarrow CH_2Cl_2 + HCl$ (dichloromethane)$CH_2Cl_2 + Cl_2 ightarrow CHCl_3 + HCl$ (trichloromethane)$CHCl_3 + Cl_2 ightarrow CCl_4 + HCl$ (tetrachloromethane)

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