Which of the following gases decolourises KMn | vedclass

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(C) . Ethane $(C_2H_6)$ and Methane $(CH_4)$ are saturated hydrocarbons and do not decolourise $KMnO_4$ solution.$B$. Acetylene $(C_2H_2)$ is a termin

Vedclass · Accepted Answer

Ethene

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(C) . Ethane $(C_2H_6)$ and Methane $(CH_4)$ are saturated hydrocarbons and do not decolourise $KMnO_4$ solution.$B$. Acetylene $(C_2H_2)$ is a terminal alkyne; it decolourises $KMnO_4$ solution and forms a red precipitate with ammoniacal cuprous chloride $(Cu_2Cl_2)$.$C$. Ethene $(C_2H_4)$ is an alkene; it decolourises $KMnO_4$ solution (Baeyer's reagent) due to the presence of a double bond,but it does not react with ammoniacal cuprous chloride because it lacks acidic hydrogen atoms.$D$. Therefore,the correct answer is Ethene.

Which of the following gases decolourises $KMnO_4$ solution but does not give a precipitate with ammoniacal cuprous chloride?

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