The compound shown decolourises bromine water. Select all of the structures shown that also decolourise bromine water.

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B, D

Bromine water is decolourised by alkenes and alkynes (addition) and by phenols (substitution to give a white precipitate). B (phenol) and D (but-2-yne) react. A (methyl benzoate, a deactivated arene) and C (propanone) do not.

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