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MHT CET2008ChemistryAlcohols Phenols and Ethers

The correct order of boiling point for primary (1^ ) , secondary (2^ ) and tertiary (3^ ) alcohols is

Options

  1. A1^ >2^ >3^
  2. B3^ >2^ >1^
  3. C2^ >1^ >3^
  4. D2^ >3^ >1^

Correct answer

A. 1^ >2^ >3^

Step-by-step solution

Alcohols with same molecular weight are expected to have almost same boiling point however two more factors other than molecular weight are important, they are namely H-bonding and surface area of molecule. Both these factors are least in 3^ alcohols and maximum in 1^ alcohols. Hence, 3^ alcohols have least boiling point while 1^ alcohols have maximum boiling point.

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