An organic compound de colourises Br2 water and also gives red ppt. with CuCl2 solution. The compound is

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CH2=CH2

CH3−CH=CH2

CH3−C≡CH

CH3−C≡C−CH3

answer is C.

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Detailed Solution

CH3−C≡CH has pi bonds to decolourise bromine and has acidic hydrogen which gets replaced with Cu to give red ppt

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