$\text { Identify the reagent R used in following reaction? }$

$\text { Identify the reagent R used in following reaction? }$

1. $\mathrm{HBr} / \mathrm{UV}$ light
2. $\mathrm{HBr}$
3. $\mathrm{Br}_2$
4. $\mathrm{Br}_2 / \mathrm{UV}$ light

Asked in: MHT CET 2021 (20 Sep Shift 2)

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