JEE Main · 2010 · 11 Apr 2010 · Offline · Alcohols Phenols and Ethers

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous

ZnCl_{2}

, is

(A)2-Butanol
(B)2-Methylpropan-2-ol✓ Correct
(C)2-Methylpropanol
(D)1-Butanol

Answer: (B)

Solution

The Lucas reagent, concentrated HCl with anhydrous

ZnC l_{2}

, reacts fastest with the alcohol that forms the most stable carbocation, so the order is tertiary faster than secondary faster than primary. Among the choices only 2-methylpropan-2-ol,

(C H_{3})_{3} COH

, is tertiary; it forms a stable tertiary carbocation and reacts fastest.

JEE Main · 2010 · 11 Apr 2010 · Offline · Single correct option

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