Fundamentholfundamenthol
NEET2025Chemistry
Q.

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

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

Bromine water is decolourised by compounds that either add Br across multiple bonds or undergo electrophilic substitution easily.

Phenol and aniline are strongly activated aromatic rings — they undergo rapid tribromination with Br/HO, decolourising the solution.

Styrene has a C=C that adds Br readily — decolourises bromine water.

Cyclohexane is a saturated alkane with no activated centres — it does not react with Br/HO under these conditions.

Cyclohexane does not decolourise bromine water.

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