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Friday, 9 October

JEE Main Chemistry · Aldehydes, Ketones and Carboxylic Acids

Iodoform Test for Specific Alcohols

Iodoform Test for Specific Alcohols (Aldehydes, Ketones and Carboxylic Acids) was asked 4 times in 4 JEE Main shifts, 2022–2025, out of the 42 shifts Lumi analysed. 1 of the 4 had a numerical answer.

Times asked
4
in 4 shifts
Years
2022–2025
Usual format
Single correct
Multi-step
Pattern
Comes in cycles
repeats across shifts

How it is asked

  • True statement selection on iodoform test
  • Count compounds failing a named test

Difficulty

Easy 2Medium 2Hard 0

Where it sits

Chapter: Aldehydes, Ketones and Carboxylic Acids. Topic: Alcohols and Phenols, 24 questions over 15 ideas.

Other repeat ideas in this topic

Every time it came

All 4 questions

Newest first, each with its options and official answer.

  1. 3 Apr 2025, Shift 1 · Q68Number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, 2−-Butanol,…MediumSingle correct
  2. 4 Apr 2025, Shift 2 · Q67Which among the following compounds give yellow solid when reacted with NaOI/NaOH ? (A) CH3−CH(OH)−C2H5\mathrm{CH_3-CH(OH)-C_2H_5} (B)…EasyOther
  3. 9 Apr 2024, Shift 2 · Q78Which of the following compound can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.MediumSingle correctHas a figure
  4. 29 Jun 2022, Shift 1 · Q90C6H12O6→ZymaseA→ΔNaOIB+CHI3\mathrm{C_6H_{12}O_6 \xrightarrow{Zymase} A \xrightarrow[\Delta]{NaOI} B + CHI_3} The number of carbon atoms present in the product B is…EasyNumerical value