Select the chain propagation steps in the free-radical chlorination of methane.
(1) `Cl_(2) to 2Cl^(*)` (2) `Cl^(*) + CH_(4) to CH_(3)Cl + H^(*)`
(3) `Cl^(*) + CH_(4) to CH_(3)^(*) + HCl` (4) `H^(*) + Cl_(2) to HCl + Cl^(*)`
(5) `CH_(3)^(*) + Cl_(2) to CH_(3)Cl + Cl^(*)`

Options

A. `2,3,5`
B. `1,3,6`
C. `3,5`
D. `2,3,4`

Answer

C

Explanation

Mechanism for the monochlorination of methane

Any two radicals in the reaction mixture can combine to form a molecule in which all the electrons are paired. The combination of two radicals is called a termination step because it brings the reaction to an ends by decreasing the number of radicals available to propagate the reaction.