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NEET levelSingle correct optionDifficulty 1 of 3hc004

The first (chain initiation) step in the photochemical chlorination of methane is

Aheterolysis of $Cl X_{2}$ into $Cl X^{+}$ and $Cl X^{-}$
Battack of $Cl X^{-}$ on $CH X_{4}$
Chomolysis of $Cl X_{2}$ into two chlorine atoms
Dabstraction of hydrogen from $CH X_{4}$ by $Cl X_{2}$

Answer: C

Light supplies energy to break the weak Cl-Cl bond homolytically:

Cl X_{2} h ν 2 Cl \cdot

The chlorine atoms then abstract hydrogen from methane in the propagation step.

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