Home/
Competitive Exams/
JEE Main & Advanced/
Chemistry/
Aldehydes, Ketones and Carboxylic Acids/
Question 790008
JEE Chemistry · Hard

Aldehydes, Ketones and Carboxylic Acids: Haloform reaction MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Haloform reactionHardQuestion 790008

Question

The iodoform test gives a yellow precipitate (CHI₃) with:
  1. A
    Methyl ketones (CH₃COR) and CH₃CH(OH)R
    Correct
  2. B
    All ketones
  3. C
    Aldehydes only
  4. D
    Primary alcohols

Correct answer

Methyl ketones (CH₃COR) and CH₃CH(OH)R

Explanation

Iodoform test: I₂/NaOH. Positive for: (1) methyl ketones (CH₃CO−R), (2) CH₃CHOH−R (oxidised to methyl ketone in situ), (3) ethanal (CH₃CHO), (4) ethanol (CH₃CH₂OH). CHI₃ (iodoform) = yellow precipitate with antiseptic smell.

Review Aldehydes, Ketones and Carboxylic Acids notesStart timed chapter practice