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What is the primary product formed when 3,3-dimethyl-2-butanol undergoes heating with concentrated sulfuric acid?

1. 2,3-dimethyl-2-butene
2. 2,3-dimethyl-1-butene
3. 3,3-dimethyl-1-butene
4. 3,3-dimethyl-2-butene

Correct answer: 2,3-dimethyl-2-butene

Solution

When 3,3-dimethyl-2-butanol is heated with H₂SO₄, dehydration occurs, leading to the formation of the more stable alkene, 2,3-dimethyl-2-butene, as the major product due to Zaitsev's rule.

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