Which one of the following compounds does not decolourize bromine water? 1. cyclohexane 2. phenol 3. styrene (vinylbenzene) 4. aniline

Answer: 1. cyclohexane Key idea: bromine water is decolourised by alkenes (addition) and by activated aromatics (substitution). Styrene: C=C adds Br₂ . Phenol and aniline: highly activated ring, give 2,4,6-tribromo products. Cyclohexane: saturated, no reaction. Option (1).

Topic: Alkenes: geometrical isomerism, electrophilic addition, Markovnikov and peroxide effect· Hydrocarbons

Which one of the following compounds does not decolourize bromine water?

(1) cyclohexane ring; (2) phenol; (3) styrene; (4) aniline

1. cyclohexane

2. phenol

3. styrene (vinylbenzene)

4. aniline

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

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Answer: 1. cyclohexane

Key idea: bromine water is decolourised by alkenes (addition) and by activated aromatics (substitution).

Styrene: C=C adds \(\mathrm{Br_2}\).
Phenol and aniline: highly activated ring, give 2,4,6-tribromo products.
Cyclohexane: saturated, no reaction.

Option (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following compounds does not decolourize bromine water?

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