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A gas formed by the action of alcoholic KOH on ethyl iodide, decolourises alkaline `KMnO_4` solution. The gas is

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A gas formed by the action of alcoholic KOH on ethyl iodide, decolourises alkaline `KMnO_4` solution. The gas is
A. `CH_4`
B. `C_2H_6`
C. `C_2H_4`
D. `C_2H_2`
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Correct Answer - C
`CH_3CH_2I+KOH(Alc) to CH_2 =CH_2 +KI + H_2O`
`CH_2=CH_2+underset"Alk Pink"(KMnO_4)overset(H_2O)to underset("Colourless")(underset(OH)underset(|)CH_2-underset(OH)underset(|)CH_2+MnO_4)`
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