JAMB Chemistry 2025 Objective — Question 28

Question 28 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

When propanone is warmed with iodine and NaOH, a product of the reaction is

A. CH₃I
B. CH₂I₂
C. CHI₃Correct
D. Iodoalkane

Explanation

This is the iodoform test. Methyl ketones (CH₃CO–) react with I₂/NaOH to give a yellow precipitate of iodoform (CHI₃). Propanone (CH₃COCH₃) undergoes this reaction.

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Chemistry 2025 Objective More Chemistry past papers