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Observation 

When kmno4 solution is added to 

  1. Ethane
  2. Ethene
  3. Ethyne

Asked by lovemaan5500 2nd February 2018, 7:47 AM
Answered by Expert
Answer:
Observations:
When KMnO4 is added to
1)Ethane:
    When KMNO4 is treated with ethane there is no reaction between ethane and KMNO4, the purple colour of KMnO4 has remained same.
 
2) Ethene:
     When  KMNO4 is treated with ethene, it oxidizes ethene to give ethane-1,2-diol (ethylene glycol).
     C H subscript 2 equals C H subscript 2 space plus space left square bracket O right square bracket rightwards arrow with K M n O subscript 4 on top space space O H minus C H subscript 2 minus C H subscript 2 minus O H space
     The purple colour of  KMNO4 changed to colourless after oxidation.
 
3) Ethyne:
 
     i) Cold KMNO4 :
     Ethyne reacts with cold KMnO4 to form formic acid.
     C H identical to C H space plus space K M n O subscript 4 space left parenthesis c o l d right parenthesis space space rightwards arrow with o x i d a t i o n on top space H C O O H space left parenthesis f o r m i c space a c i d right parenthesis 
     ii) Hot KMNO4 :

     Ethyne reacts with hot KMnO4 to form oxalic acid.   
     C H identical to C H space space plus space space left parenthesis h o t right parenthesis space K M n O subscript 4 space space rightwards arrow with o x i d a t i o n on top space space H O O C minus C O O H space left parenthesis o x a l i c space a c i d right parenthesis
Answered by Expert 2nd February 2018, 9:18 AM
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Tags: oxidation
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