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Question


How many of the given compounds cannot decolourise bromine water

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Solution

  • We know that the reddish brown colour of bromine solution in carbon tetrachloride is discharged when bromine adds up to an unsaturation site.

  • Cyclobutane (a) and cyclohexane (c) do not have any π bonds for addition reactions. Hence, they will not decolourise bromine water.

  • Compound (b) is benzene. Benzene has π electrons that are delocalised over the entire ring. Benzene will not undergo addition reactions since addition reactions will destroy the aromaticity of benzene. Hence, it will not decolourise bromine water.

  • An alkyne is given in option (d). Since unsaturation is present in but-2-yne, it will decolourise bromine water.

  • Thus, the compounds given in (a), (b), and (c) will not decolourise bromine water.


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