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ChemistryNEET 2025Alkenes and alkynes: addition reactions, Markovnikov

Hydrocarbons

Which one of the following compounds (shown) does not decolourise bromine water?

Question 77 as printed in the NEET 2025 booklet

  1. A.Structure (1)
  2. B.Structure (2)
  3. C.Structure (3)
  4. D.Structure (4)

Solution

Bromine water is decolourised by addition to C=C (styrene) and by electrophilic bromination of activated rings (phenol, aniline give tribromo products). Cyclohexane (1) is saturated and unactivated, so it does not react.

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