CONCEPT: • Iodoform test : The test which is used to check the presence of carbonyl compounds with the structure R-CO-CH3 or alcohols with the structure R-CH(OH)-CH3 in a given unknown substance is called the iodoform test. The followingcompounds will give a positive iodoform test: 1. Acetaldehyde 2. Methyl Ketones 3.Ethanol 4.Secondary Alcohols that contain Methyl Groups in Alpha Position EXPLANATION: • Acetone, ethyl alcohol, and 2- pentanol will give a positive iodoform test. • Diethyl ketone is not any carbonyl or alcohol so it will not give an iodoform test. Hence option 2 is correct.