Question

Following compounds are given:
(i) CH₃CH₂OH (ii) CH₃COCH₃
(iii) CH₃ - CHOH
|
CH₃
(iv) CH₃OH
Which of the above compound(s), on being warmed with
iodine solution and NaOH, will give iodoform?
(a) (i) and (ii) (b) (i), (iii) and (iv)
(c) Only (ii) (d) (i), (ii) and (iii)

Answer 1

I think the correct answer is (c)

Answer 2

(i), (iii) and (iv) is the correct option.

Explanation:

• Haloform reaction is the reaction type in which a haloform is produced.

• These reactions use the corresponding halogen in sodium hydroxide as the reagent.

• These reactions can only occur in secondary alcohols and in methyl ketones.

• The ethanol is the only primary alcohol which responds to haloform reaction.

• In option A, the reactant is ethanol.

• So it will give haloform positive.

• Option B has acetone, a methyl ketone.

• So it will be haloform positive.

• Option C is a secondary alcohol.

• So it will be haloform positive.

• Option D is methanol, a primary alcohol.

• So it won't produce haloform positive test.

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