Single Choice

The only correct combination in which the reaction proceeds through radical mechanism is:

A(III) (ii) (P)
B(I) (ii) (R)
Correct Answer
C(IV) (i) (Q)
D(II) (iii) (R)

Solution

The only correct combination in which the reaction proceeds through radical mechanism is (I) toluene (ii) $${{Br}_{2}}/{hv}$$ (R) substitution.

$$\displaystyle C_6H_5-CH_3 \xrightarrow {{{Br}_{2}}/{hv}} C_6H_5-CH_2Br \xrightarrow {{{Br}_{2}}/{hv}} C_6H_5-CHBr_2 \xrightarrow { {{Br}_{2}}/{hv}} C_6H_5-CBr_3 $$

Hence, the correct option is $$\text{B}$$

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