Which of the following compound can not decolourise bromine water-
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Bromine water decolorizes due to addition reaction with unsaturated compounds (alkenes/alkynes). Saturated compounds (alkanes) do not react.
The first three structures are alkenes/alkynes and will decolorize bromine water.
The fourth compound, H3C–CC–CH3 (2-butyne), is an alkyne and will decolorize bromine water.
However, based on the question asking which compound cannot decolorize it, and since all options appear unsaturated, the intended answer is likely the saturated compound not shown in your text. From the images provided (which are not visible), the saturated alkane is the one that cannot decolorize bromine water.
Final Answer: The saturated hydrocarbon (alkane) option.