JEE Main Chemistry question

The order of reactivity of the following alcohols (I: F-CH_2-CH(CH_3)-OH type, II: F further from OH, III: isopropanol, IV: Ph-CH(CH_3)-OH) in a carbocation-forming reaction is

(A)I > II > III > IV
(B)I > III > II > IV
(C)IV > III > I > IICorrect
(D)IV > I > III > II

Answer: (C)

Solution

Reactivity in carbocation-forming substitution/elimination depends on cation stability: a benzylic cation (IV, resonance-stabilised by the phenyl ring) is most stable and reacts fastest, followed by the simple secondary (isopropyl-type) cation (III); an

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Question ID VK-148590