The increasing order of reduction of alkyl halides with zinc and dilute HCl is
(i) R–Cl < R–I < R–Br
(ii) R–Cl < R–Br < R–I
(iii) R–I < R–Br < R–Cl
(iv) R–Br < R–I < R–Cl

Answers (1)

The answer is the option (ii) R-Cl < R-Br < R-I

Explanation: We know that reactivity of halogen decreases down the group; therefore, reduction of alkyl halides with Zn/HCl follow reverse order.

Reactivity of reduction \alpha 1bond strength of C-X

Reactivity of reduction \propto \frac{1}{bond strength C-X}

It also depends on the size of the halogen. Therefore, we can say that to increase the reactivity; the bond strength must be reduced.

 

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