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Which of the following give the positive test with alkaline KMnOs solution-(A) CHa(B) CH3-CH3, (C) CH2 CH2(D) of these |
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Answer» Alkenes are unsaturated hydrocarbons. When alkenes react with alkaline KMnO4, the alkenes are oxidized to alcohols. One hydroxyl group attaches to each carbon on either side of the carbon-carbon double bond. KMnO4 is first reduced to MnO4(2-), a dark green solution and then it's further reduced to MnO2, a dark brown precipitate.Hence option B ethene is alkene |
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