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Answer: 4. 2,3-dimethylbutane

Key idea: a tertiary carbon is bonded to three other carbons (one C-H).

  • 2,2-dimethylbutane: one quaternary C, no tertiary carbon.
  • n-hexane: none.
  • 2-methylpentane: only one tertiary carbon.
  • 2,3-dimethylbutane \(\mathrm{(CH_3)_2CH-CH(CH_3)_2}\): two tertiary carbons.

Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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