Identify the most suitable reagents (I) and (II) for the following sequence of reactions

Identify the most suitable reagents (I) and (II) for the following sequence of reactions

1. $(\mathrm{I})=$ conc. $\mathrm{H}_2 \mathrm{SO}_4,(\mathrm{II})=\mathrm{HBr}$
2. $(\mathrm{I})=$ aq. $\mathrm{KOH},(\mathrm{II})=\mathrm{HBr} /$ peroxide
3. $(\mathrm{I})=$ alc. $\mathrm{KOH},(\mathrm{II})=\mathrm{HBr} /$ peroxide
4. $(\mathrm{I})=$ alc. $\mathrm{KOH},(\mathrm{II})=\mathrm{HBr}$

Solution

When 1-bromopropane react with alcoholic $\mathrm{KOH}$, it will form prop-1-ene $(X)$. Alcoholic $\mathrm{KOH}$ is used to give elimination reaction. In next step, $\mathrm{HBr}$ (II) is used to give Markownikoff's addition to the alkene and produces 2-bromopropane.

Asked in: AP EAMCET 2021 (25 Aug Shift 1)

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