The molecular weight of benzoic acid in benzene as determined by depression in the freezing point method corresponds to (A) Solvation of benzoic acid. (B) Ionization of benzoic acid. (C) Dimerisation of benzoic acid.(D) Trimerisation of benzoic acid.

Answer : (C) Dimerisation of benzoic acid.

Benzoic acid is an organic compound that is described by the chemical formula C6H5COOH. It consists of a carboxyl group attached to a benzene ring. Therefore, benzoic acid is said to be an aromatic carboxylic acid.

  • The depression in freezing point method is used to estimate the molecular weight of benzoic acid in benzene, which corresponds to the dimerisation of benzoic acid.
  • The sum of the atomic weights of all the atoms present in a compound can be used to calculate its molecular mass. Benzoic acid has a molecular mass of 122 g/mol.
  • By using the depression in freezing point approach, the molecular weight of benzoic acid was discovered to be 244 g/mol.

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