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.