Which is the best reagent to convert isopropyl alcohol to isopropyl bromide?

H B r

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{S O B r}_{2}

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{B r}_{2}

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{C H}_{3} M g B r

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Solution

The correct option is A ${S O B r}_{2}$
$(C H_{3})_{2} C H - O H S O B r_{2} - ---- \to P y r i d i n e (C H_{3})_{2} C H - B r + S O_{2} + H B r$
The by-products $S O_{2}$ and $H B r$ are gaseous and hence are released into the atmosphere. This shifts the reaction equilibrium to the right side and also makes the purification of the produced alkyl halide easier.

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Why is the reactivity of halogen atom in isopropyl chloride less reactive than in isopropyl bromide?

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