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JIPMER2018ChemistrySurface Chemistry

Which of the following is not a surfactant?

Options

  1. ACH ₃- ( CH ₂ )₁₅- N ⁺ ( CH ₃ )₃ Br ⁻
  2. BCH ₃- ( CH ₂ )₁₄- CH ₂ NH ₂
  3. CCH ₃- ( CH ₂ )₁₆- CH ₂ OSO ₂ Na ⁺
  4. DOHC - ( CH ₂ )₁₄- CH ₂- COO ⁻ Na ⁺

Correct answer

B. CH ₃- ( CH ₂ )₁₄- CH ₂ NH ₂

Step-by-step solution

Every surfactant contains two parts a hydrophobic part and a hydrophilic part. The compound CH ₃ ( CH ₂ )₁₄ CH ₂ NH ₂ contains only hydrophobic part but no hydrophilic part, hence, it is not a surfactant. All other options are surfactant gathered CH ₃- ( CH ₂ )₁₅- + N ( CH ₃ )₃ Br ⁻ CH ₃- ( CH ₂ )₁₆- CH ₂ OSO ₂⁻ Na ⁺ OHC - ( CH ₂ )₁₄- CH ₂- COO ⁻ Na ⁺ gathered

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