JEE Main 2026 — Jan 23, Shift 2 — Chemistry solution

JEE Main2026Jan 23, Shift 2Chemistry

Which of the following statements are TRUE about Haloform reaction?

A. Sodium hypochlorite reacts with KI to give KOI.

B. KOI is a reducing agent.

C. $α$ , $β$ -unsaturated methylketone

will give iodoform reaction.

D. Isopropyl alcohol will not give iodoform test.

E. Methanoic acid will give positive iodoform test.

Choose the correct answer from the options given below:

A
A, C & E only
B
A, B & C only
C
A & C only
D
B, D & E only

Solution

(A) $N a O C l + K I \to N a C l + K O I$ . The hypoiodite ion is generated this way. True.

(B) $K O I$ contains iodine in the $+ 1$ oxidation state and acts as an oxidising agent (it oxidises methyl ketones and the methylene of secondary alcohols in the haloform reaction). False.

(C) Pent-3-en-2-one ( $C H_{3} - C H = C H - C O - C H_{3}$ ) contains an intact $- C O C H_{3}$ group, so it gives a positive iodoform test. True.

(D) Isopropyl alcohol ( $C H_{3} - C H (O H) - C H_{3}$ ) is oxidised by $N a O I$ to acetone and then haloformed. It does give a positive test, so the statement is False.

(E) Methanoic acid ( $H C O O H$ ) has no $- C O C H_{3}$ or $C H_{3} C H (O H) -$ group. It gives a negative test. False.

Only A and C are true.

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