Which among the following compounds give yellow solid when reacted with $\mathrm{NaOI} / \mathrm{NaOH}$ ? (A) (B) $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{OH}$ (C) (D) (E) Choose the correct answer from the options given below :

JEE Main · 2025 · 04 Apr 2025 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

Which among the following compounds give yellow solid when reacted with

NaOI / NaOH

?
(A)
(B)

CH_{3} - CH_{2} - CH_{2} - OH

(A)(B), (C) and (E) Only
(B)(A) and (C) Only✓ Correct
(C)(C) and (D) Only
(D)(A), (C) and (D) Only

Answer: (B)

Solution

The haloform reaction with sodium hypoiodite gives the yellow solid iodoform only from a methyl group attached to a carbonyl,

C H_{3} CO -

, or a methyl group on a carbinol carbon,

C H_{3} CH (OH) -

, which is first oxidised to the methyl ketone. Butan-2-ol carries the

C H_{3} CH (OH) -

unit and butanone carries the

C H_{3} CO -

unit, so both give the yellow iodoform. Propan-1-ol, acetic acid and propanal lack this grouping and give no yellow solid. The compounds that give the yellow solid are butan-2-ol and butanone.

JEE Main · 2025 · 04 Apr 2025 · Shift 2 · Single correct option

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JEE Main · 2025 · 04 Apr 2025 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

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