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ICSE Class 10 Chemistry 2019 Paper

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Arrange the following according to the instructions given in brackets:
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Question : 38 of 86
Marks: +1, -0
Ethane, methane, ethene, ethyne.
(In the increasing order of the molecular weight) [H=1,  C=12][H=1,\;C=12]
Solution:  
Methane << Ethyne << Ethene << Ethane
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