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TEEN Chemistry QUESTION #1102
Question 1
Which one of the following compounds does NOT decolourize bromine water?
  • Styrene (vinyl benzene)
  • Aniline
  • Cyclohexane✔️
  • Phenol
Correct Answer Explanation
Bromine water is decolourized by compounds with C=C double bonds, –NH\(_2\) groups, or –OH (phenol) through electrophilic addition or substitution. Styrene (C=C) — decolourizes ✓. Aniline (–NH\(_2\) activates ring) — decolourizes ✓. Cyclohexane — saturated, no functional group → does NOT decolourize ✗. Phenol — activated ring, decolourizes ✓.