Question

The increasing order of reduction of alkyl halides with zinc and dilute HCl is
A. R-ClltR-IltR-br
B. R-ClltR-BrltR-I
C. R-IltR-BrltR-Cl
D. R-BrltR-IltR-Cl

Answer 1

Correct Answer - B
The reactivity of halogens with alkane is `F_2 gt Cl_2 gt Br_2 gt I_2` . Hence , reduction of alkylhalide with Zn and dilute HCl follows reverse order, i.e.
R-IgtR-BrgtR-Cl. Further, the reactivity of this reduction increases as the strength of C-X bond decreases.