MHT CET 2024 Chemistry question

Identify the reactivity order for halogens towards alkanes.

(A)
(B)
(C)Correct
(D)

Answer: (C)

Solution

Halogenation of alkanes is a free-radical chain reaction and its rate depends on how easily the halogen radical abstracts H from the alkane. Reactivity decreases down the group as the X-X bond becomes weaker but the H-X bond formed becomes much weaker and the reaction less exothermic:

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Question ID VK-099680