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Among alcohols, the reactivity order with HX (e.g. HCl) is:
A1° > 2° > 3°
B3° > 2° > 1° (tertiary fastest via stable carbocation)
CAll equal
DAromatic > aliphatic
Answer & Solution
Correct answer: B. 3° > 2° > 1° (tertiary fastest via stable carbocation)
S$_N$1 mechanism: 3° alcohol → 3° carbocation (most stable due to hyperconjugation and inductive effects). 3° > 2° > 1°. Methanol/ethanol need more forcing conditions or different mechanism (S$_N$2).
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