Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine?

To show decolourisation, the compound must be unsaturated.

Options A, B, and C will undergo elimination reaction to form unsaturated compound.

Option D will undergo nucleophilic substitution and hence, will have no unsaturation. Hence, it cannot decolourise $$Br_2$$ water.

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