Match the following
List – I (Source) List – II (Carboxylic Acid)
| Source | Carboxylic Acid |
| A. Vinegar | I. HCOOH |
| B. Butter | II. CH3CH2COOH |
| C. Ants | III. CH3COOH |
| IV. CH3CH2CH2COOH |





Consider the following reaction of benzene. the percentage of oxygen is _______ %. (Nearest integer) 