JEE Main Chemistry question

The addition of oxygen gas to a reaction mixture of chlorine and methane (photochemical chlorination)

(A)Accelerates the reaction
(B)Retards the reaction for some timeCorrect
(C)Has no effect on the rate of reaction
(D)May accelerate or retard the reaction depending upon the amount of oxygen

Answer: (B)

Solution

O is an efficient radical scavenger/inhibitor: it reacts with the chain-carrying methyl (and chlorine) radicals to form unreactive peroxy-type species,

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Question ID VK-142489