Question

Which of the following compounds containing carbonyl group will give coloured crystalline compound with

• A. $$C{H}_{3}COCl$$
• B. $$C{H}_{3}COC{H}_3$$
• C. $$C{H}_{3}CO\left(O{C}_2{H}_5\right)$$
• D. $$C{H}_{3}CON{H}_2$$

Answer 1

The correct option is B $$C{H}_{3}COC{H}_3$$

2,4-dinitrophenylhydrazine (2,4-DNP) gives orange colour with aldehydes and ketones. This is used for identification of ​aldehydes and ketones​.

Among the given compounds, only acetone will give crystalline coloured derivative with 2,4-DNP.

Hence, option (b) is the correct answer.