Select the chain propogation steps in the free-radical chlorination of methane
1) `Cl_2 to 2Cl^(*)` 2) `Cl^(*)+ CH_4 to CH_3Cl + H^(*)`
3) `Cl^(*)+CH_4 to CH_3^(*) + HCl` 4)`H^(*) + Cl_2 to HCl + Cl^(*)`
5) `CH_3^(*) + Cl_2 to CH_3Cl + 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.