JEE Chemistry 2026 Question with Solution

Given: Statements about the Haloform reaction are to be checked for truth.

Find: Which option contains the true statements.

The solution states that hypohalites are oxidizing agents and evaluates each statement one by one.

• A. $\text{NaOCl}$ reaction with $\text{KI}$ is taken in the solution as generating the active intermediate $\text{OI}^-$ in educational context, so it is treated as True.
• B. $\text{KOI}$ has iodine in the $+1$ oxidation state and acts as an oxidizing agent, not a reducing agent. So False.
• C. The compound $CH_3-CH=CH-C=O-CH_3$ contains the required methyl ketone unit, so it gives the iodoform reaction. Hence True.
• D. Isopropyl alcohol $\left(\text{CH}_3\text{CH(OH)CH}_3\right)$ contains the methyl carbinol group and gives a positive iodoform test. So the statement is False.
• E. Methanoic acid $\left(\text{HCOOH}\right)$ does not contain the required $\text{CH}_3\text{CO}-$ or $\text{CH}_3\text{CH(OH)}-$ unit. So False.

Therefore, the true statements are A and C.

The correct option is C.

Given: A multiple-statement question on the Haloform reaction.

Find: Identify the true statements using the condition for a positive iodoform test.

A compound gives the iodoform test if it contains a methyl ketone group or can be oxidized to one, as in secondary alcohols of the form $\text{CH}_3\text{CH(OH)R}$.

For statement C, the compound $CH_3-CH=CH-C=O-CH_3$ is an $\alpha, \beta$-unsaturated methyl ketone, but it still contains the essential $\text{CH}_3\text{CO}-$ unit. Hence it gives the test.

For statement D, isopropyl alcohol is of the form $\text{CH}_3\text{CH(OH)CH}_3$, so it is oxidized to acetone and therefore gives a positive iodoform test. Hence the statement is false.

For statement E, methanoic acid lacks the necessary structural requirement, so it does not respond positively.

The provided solution also marks A as true in the intended educational context and B as false because hypoiodite behaves as an oxidizing agent.

Thus, only A and C are true, so the correct option is C.