${\mathrm{CH}}_3{\mathrm{COCH}}_3+\mathrm{NaOH}+{\mathrm{Na}}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_5\mathrm{NO}\right]+{\mathrm{H}}_2\mathrm{O}\to$gives a wine red colour. This changes to yellow colour on standing. This test is called

Explanation: The 2,4-DNP test is a chemical test which is used to detect the presence of methyl ketones. It involves the reaction of a methyl ketone such as acetone with sodium hydroxide, sodium 2,4-dinitrophenolate and water. This reaction gives a wine red colour, which changes to yellow colour on standing.

Therefore, the correct option is D. 2, 4 - DNP test