The increasing order of reduction of alkyl halides with zinc and dilute $H C l$ is:

R - C l < R - I < R - B r

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R - C l < R - B r < R - I

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R - I < R - B r < R - C l

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R - B r < R - I < R - C l

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Solution

The correct option is C $R - C l < R - B r < R - I$
As the size of the halogen increases down the group, the strength of $C - X$ bond decreases, as a result, reactivity increases. Hence, The increasing order of reduction of alkyl halides with zinc and dil. $H C l$ is $R - C l < R - B r < R - I$ .
Hence, $B$ is the correct answer.

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