Which of the following compounds can give a positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite?
A
Option 1
B
Option 2
C
Option 3
D
Option 4

Question

Which of the following compounds can give a positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite?

Accepted Answer

Given: A compound giving a positive iodoform test must contain a methyl ketone group $-COCH_3$ or an alcohol that can be oxidized to it.

Find: Which option gives a positive iodoform test.

The solution states that the iodoform test identifies methyl ketones or compounds oxidizable to methyl ketones.

It further concludes:

Compound 1 does not satisfy the condition.
Compound 2 contains the required $-COCH_3$ group.
Compound 3 does not satisfy the condition.
Compound 4 does not satisfy the condition.

Therefore, only Compound 2 gives a positive iodoform test. The correct option is B.

Reaction scheme showing a gem-dichloro compound converted by aqueous KOH to a gem-diol, then to a ketone, which on treatment with KOI gives carboxylate and CHI3 yellow precipitate.

Given: The reaction scheme in the solution shows formation of a ketone that responds to the iodoform test.

Find: Which option matches the compound giving positive iodoform test.

From the figure, aqueous KOH converts the precursor into a carbonyl compound, and subsequent treatment with $KOI$ gives $CHI_3$ as yellow precipitate.

The ketone formed is of the methyl ketone type, so it gives a positive iodoform test.

Hence, the correct option is B.

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