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KCET2026ChemistryGeneral Organic Chemistry

The number of chain isomers possible for the hydrocarbon with molecular formula C ₅ H ₁₂ is

Options

  1. A4
  2. B3
  3. C2
  4. D1

Correct answer

B. 3

Step-by-step solution

The given molecular formula is C ₅ H ₁₂ , which corresponds to an alkane (pentane). The possible chain isomers are: 1. n-pentane: CH ₃- CH ₂- CH ₂- CH ₂- CH ₃ 2. isopentane (2-methylbutane): CH ₃- CH ( CH ₃)- CH ₂- CH ₃ 3. neopentane (2,2-dimethylpropane): C ( CH ₃)₄ Thus, there are 3 chain isomers possible for C ₅ H ₁₂ . Answer: 3

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