Question

Which of the following can give haloform test?

• A. Ethyl alcohol
• B. Acetaldehyde
• C. Acetone
• D. All of the above.

Answer 1

The correct option is D All of the above.

Iodoform reaction: A chemical reaction in which a methyl ketone is oxidized to a carboxylate by reaction with aqueous $NaOH$ and $I_2$. The reaction also produces iodoform $\left(CH{I}_3\right)$, a yellow solid which may precipitate from the reaction mixture. The iodoform reaction been used as a chemical test for the presence of a methyl ketone moiety.
Acetone and acetaldehyde have methyl ketone moiety thus give iodoform reaction. Only those alcohols which contain $-CHOHC{H}_3$ group undergo haloform reaction. Ethyl alcohol also has $-CHOHC{H}_3$ group thus it will also show iodoform test.
similarly if we use aqueous $NaOH$ and $C{l}_2$ then reaction produces chloroform $\left(CHC{l}_3\right)$ as shown below:
$RCOC{H}_3+NaOH+C{l}_2\to RCO{O}^{-}N{a}^{+}+CHC{l}_3$.
all the given compound show iodoform test hence correct option is (d).