RE-NEET 2026 Chemistry Haloform Reaction MCQ Question

Chemistry | Haloform Reaction

Topic: Aldehydes, Ketones & Carboxylic Acids Difficulty: 🟡 Medium

✅ Ans: B

Step 1: Friedel–Crafts acylation

$$C_6H_6 \xrightarrow{CH_3COCl/AlCl_3} C_6H_5COCH_3$$

Product = acetophenone

Step 2: $NaOCl$ → Haloform reaction

Methyl ketone gives:

$$C_6H_5COCH_3 \xrightarrow{NaOCl} C_6H_5COONa + CHCl_3$$

So,

• P = Sodium benzoate → on acidification gives benzoic acid
• Q = Chloroform $(CHCl_3)$ → on exposure to air & light can form phosgene $(COCl_2)$, a poisonous gas.

$$\boxed{\text{B is correct}}$$

❌ Other options

• A ❌ → P is a salt, not an aromatic compound.
• C ❌ → P is not a carbonyl compound.
• D ❌ → Q is chloroform, not a primary alcohol.

📌 NCERT: Methyl ketones give haloform reaction with halogen/hypohalite, producing a carboxylate salt and haloform.

🧠 NEET Trick: $CH_3CO-R + NaOCl \rightarrow RCOONa + CHCl_3$ → methyl ketone → carboxylate + chloroform.