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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm023

For (2,3,3-trimethylhexane), which of the following statements is/are correct?

  1. AIt contains two tertiary carbon atoms.
  2. BIt contains five primary carbon atoms.
  3. CIt contains exactly one quaternary carbon atom.
  4. DIt contains six hydrogen atoms attached to secondary carbons.

Answer: B, C

Carbons: five CH3 are primary, the two CH2 are secondary, the CH of the isopropyl unit is the only tertiary carbon, and C3 is the only quaternary carbon (5 + 2 + 1 + 1 = 9). Hydrogens: 15 primary, 4 secondary (two CH2) and 1 tertiary. So the statements on five primary carbons and one quaternary carbon are correct. Two tertiary carbons and six secondary H are wrong.
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