Answers

2015-02-11T19:17:12+05:30
Only double or triple bond containing compound decolouries the alkaline KMnO4 so  only ethene can decolouries the KMnO4.
CH2=CH2 + KMnO4 ---------------->  CH2OH-CH2OH  (glycol)
CH3-CH3 + KMnO4 -------------------> no reaction
 
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2015-02-11T19:27:00+05:30
Only a double or triple bond containing compound decolourise the alk. KMnO4 so  it means ethene can decolourise the KMnO4.

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