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Question

The molecular weight of benzoic acid in benzene as determined by depression in the freezing point method corresponds to


  1. Solvation of benzoic acid

  2. Ionization of benzoic acid

  3. Dimerisation of benzoic acid

  4. Trimerisation of benzoic acid.

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Solution

The correct option is C

Dimerisation of benzoic acid


Explanation for correct option:

(c) Dimerisation of benzoic acid

  • By using the depression in freezing point approach, it is discovered that benzoic acid has a molecular weight of 244.
  • The exact mass of the benzoic acid molecule is 122.
  • As a result, it is equivalent to the dimers created through hydrogen bonding.
  • Hence this is the correct option.

Explanation for incorrect options:

(a) Solvation of benzoic acid

  • The molecular weight of benzoic acid in benzene is determined by depression in the freezing point method.

(b) Ionization of benzoic acid

  • Benzoic acid does not ionize as it is covalent in nature

(d) Trimerisation of benzoic acid.

  • Dimerization occurs in benzoic acid, not trimerization
  • Hence this is the incorrect option.

So, option (c) Dimerisation of benzoic acid is the correct answer.


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