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JEE Main202623 January 2026Evening ShiftChemistryAldehydes and KetonesActual

Which of the following statements are TRUE about Haloform reaction?: A. Sodium hypochlorite reacts with KI to give KOI. B. KOI is a reducing agent. C. , -unsaturated methylketone ( CH ₃- CH = CH - O O - CH ₃ ) will give iodoform reaction. D. Isopropyl alcohol will not give iodoform test. E. Methanoic acid will give positive iodoform test. Choose the correct answer from the options given below:

Options

  1. AA, C & E Only
  2. BB, D & E Only
  3. CA & C Only
  4. DA, B & C Only

Correct answer

C. A & C Only

Step-by-step solution

In the haloform reaction: (A) Sodium hypochlorite reacts with KI in acidic medium to generate the active halogenating species, forming KOI (potassium iodite/hypoidite). TRUE. (B) KOI serves as an oxidizing agent (not reducing) in the reaction, converting methyl ketones to carboxylic acids. FALSE. (C) α,β -unsaturated methylketones possess the essential methyl ketone group ( CH₃CO- ) required for haloform reaction, allowing iodination and subsequent cleavage. TRUE. (D) Isopropyl alcohol (CH₃)₂CHOH lacks a methyl ket

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