A gas decolourises alkaline KMnO(4) solu...

A gas decolourises alkaline `KMnO_(4)` solution but does not give precipitate with silver nitrate. It is:

A

`CH_4`

B

`C_2H_4`

C

`C_2H_2`

D

`C_2H_6`

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The correct Answer is:

B

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