Question
What do you observe when ethene is passed through alkaline $KMnO_4$ solution?

Answer

When ethylene is passed through alkaline $KMnO _4$ solution 1, 2-Ethanediol is formed. The Purple color of $KMnO _4$ decolorizes.
$CH_2=CH_2+H-O-H +[O] \rightarrow CH_2(OH)-CH_2(OH)$
Cold alkaline
$KMnO_4$​​​​​​​ solution

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