**Dehydration** of alcohols to alkenes with concentrated H₂SO₄ follows the order:
A1° > 2° > 3°
B3° > 2° > 1° (more stable carbocation favours E1)
CAll equal
DAromatic > aliphatic
Answer & Solution
Correct answer: B. 3° > 2° > 1° (more stable carbocation favours E1)
E1 dehydration: more stable carbocation forms faster. 3° (most stable cation, lowest activation E) > 2° > 1°. Tertiary alcohols dehydrate even at lower temperatures (~20% H₂SO₄, ~85 °C); primary need conc. H₂SO₄, ~170 °C.
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