The aqueous solution of the following compound contains both ions and molecules.
Acetic acid
The electrolyte which contains only ions in its aqueous form is a strong electrolyte. The electrolyte which contains both ions and molecules is called a weak electrolyte.
Explanation for the correct option:
(c) Acetic acid
It is a weak electrolyte. And therefore it contains both ions and molecules. So this option is correct.
Explanation for the incorrect options:
Nitric acid, Hydrochloric acid and Sulphuric acid are strong electrolytes.
Hence, option( c) Acetic acid is correct.