In the given pairs of alcohols,in which pair | vedclass

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(D) The reactivity of alcohols towards $HBr$ follows the order $3^\circ > 2^\circ > 1^\circ$ because the reaction proceeds via a carbocation intermedi

Vedclass · Accepted Answer

$CH_3-CH(OH)-CH_2-CH_3$ and $CH_3-C(OH)(CH_3)-CH_2-CH_3$

Vedclass · Answer

(D) The reactivity of alcohols towards $HBr$ follows the order $3^\circ > 2^\circ > 1^\circ$ because the reaction proceeds via a carbocation intermediate ($S_N1$ mechanism).In option $(D)$,the first alcohol is a secondary $(2^\circ)$ alcohol ($CH_3-CH(OH)-CH_2-CH_3$,butan$-2-$ol) and the second alcohol is a tertiary $(3^\circ)$ alcohol ($CH_3-C(OH)(CH_3)-CH_2-CH_3$,$2$-methylbutan$-2-$ol).Since a $3^\circ$ carbocation is more stable than a $2^\circ$ carbocation,the second alcohol is more reactive than the first.

In the given pairs of alcohols,in which pair is the second alcohol more reactive than the first towards hydrogen bromide $(HBr)$?

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But$-2-$ol is:

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