Haloform test is given by

(A) Formaldehyde
(B) Acetone
(C) $α$-Phenyl ethyl alcohol
(D) Acetaldehyde

Choose the correct answer from the options given below:

(B), (C) and (D) only

The correct answer is Option (4) → (B), (C) and (D) only

Haloform test is given by compounds containing the group CH₃–CO– (methyl ketones) or CH₃–CH(OH)– (which can be oxidised to methyl ketones).

• (A) Formaldehyde (HCHO) -- INCORRECT
  Does not contain –COCH₃ group and does not give haloform test.
• (B) Acetone (CH₃COCH₃) ---- CORRECT
  It is a methyl ketone → gives haloform test.
• (C) α-Phenyl ethyl alcohol (C₆Hâ‚…–CHOH–CH₃) -- CORRECT
  On oxidation, it forms acetophenone (a methyl ketone) → gives haloform test.
• (D) Acetaldehyde (CH₃CHO)---CORRECT
• It contains the –CH₃CO– framework → gives haloform test.