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JEE Main levelOne or more correct optionsDifficulty 2 of 3hc029

Which of the following reagent sequences convert but-1-ene, $CH X_{3} CH X_{2} CH = CH X_{2}$ , mainly into butan-2-ol?

A $HBr$ with peroxide, then aqueous $NaOH$ (substitution)
B $Hg (OAc) X_{2}$ in $H X_{2} O$ , then $NaBH X_{4}$
C $H X_{2} O$ with dilute $H X_{2} SO X_{4}$
D $BH X_{3} \cdot THF$ , then $H X_{2} O X_{2} / NaOH$

Answer: B, C

Acid hydration and oxymercuration-demercuration both follow Markovnikov orientation, placing OH on

C X_{2}

to give butan-2-ol. Hydroboration-oxidation and the peroxide route (1-bromobutane then substitution) both place the functional group on

C X_{1}

, giving butan-1-ol.

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