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A gas decolourises alkaline `KMnO_4` solution but does not give precipitate with `AgNO_3`, it is

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A gas decolourises alkaline `KMnO_4` solution but does not give precipitate with `AgNO_3`, it is
A. `CH_4`
B. `C_2H_4`
C. `C_2H_2`
D. `C_2H_6`
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Correct Answer - B
`C_2H_4 (CH_2=CH_2)` decolourises `KMnO_4` solution but does not give ppt. with `AgNO_3` solution.
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