Question

5 compounds which gives a positive response when treated with Iodine in alkaline medium, 2,4-dinitrophenyl hydrazine reagent and sodium Nitroprusside, whilst, shows a negative response to Fehling’s reagent, Tollen’s reagent and chromic acid.

Answer 1

A positive iodoform test is given by the compounds having CH3CO group in their structure. When Iodine and sodium hydroxide are added to a compound that contains either a methyl ketone or a secondary alcohol with a methyl group in the alpha position, a pale yellow precipitate of iodoform is formed.