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MHT CET202618 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Which of the following isomers of C ₄ H ₉ OH has lowest boiling point ?

Options

  1. An - Butyl alcohol
  2. BIsobutyl alcohol
  3. Csec-Butyl alcohol
  4. Dtert Butyl alcohol

Correct answer

D. tert Butyl alcohol

Step-by-step solution

The boiling point of isomeric alcohols decreases with an increase in branching. As branching increases, the molecule becomes more spherical in shape, which decreases the effective surface area. A smaller surface area results in weaker van der Waals forces of attraction between the molecules, thereby lowering the boiling point. Among the given isomers of C ₄ H ₉ OH , tert-butyl alcohol is the most branched. Therefore, tert-butyl alcohol has the lowest boiling point. Answer: tert Butyl alcohol

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