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MHT CET202520 Apr 2025Morning ShiftChemistryAlcohols Phenols and EthersActual

Which among the following compounds has lowest boiling point?

Options

  1. A( C ₂ H ₅ )₂ NH
  2. BC ₂ H ₅ ~N ( CH ₃ )₂
  3. Cn - C ₄ H ₉ OH
  4. DC ₂ H ₅ COOH

Correct answer

B. C ₂ H ₅ ~N ( CH ₃ )₂

Step-by-step solution

Boiling point in isomeric alcohols depends primarily on molecular branching. Increased branching reduces surface area, weakening van der Waals forces between molecules. For C₄ H₁₀ O isomers: Butan-1-ol ( CH₃ CH₂ CH₂ CH₂ OH ) is straight-chain Butan-2-ol ( CH₃ CH₂ CH(OH)CH₃ ) has minimal branching 2-Methylpropan-1-ol ( (CH₃ )₂ CHCH₂ OH ) shows moderate branching 2-Methylpropan-2-ol ( (CH₃ )₃ COH ) is maximally branched The compact, spherical shape of 2-methylpropan-2-ol minimizes intermolecular contact area, resulti

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