Which of the following compounds will respond to iodoform test?

(A) Acetone
(B) Ethyl methyl ketone
(C) Acetophenone
(D) Pentan-2-one

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

The correct answer is Option (3) → (A), (B), (C) and (D)

Iodoform test is given by compounds containing the methyl ketone group: $-COCH_3$.

Option A: Acetone

Acetone contains the methyl ketone group ($CH_3CO-$) and gives a positive test.

Option B: Ethyl methyl ketone

Ethyl methyl ketone contains the $-COCH_3$ group and undergoes the haloform reaction.

Option C: Acetophenone

Acetophenone contains a methyl ketone group attached to a benzene ring ($C_6H_5COCH_3$).

Option D: Pentan-2-one

Pentan-2-one contains the $CH_3CO-$ group at the second carbon and therefore gives the test.