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CBSE Class 10 Science 2015 Term II Delhi Set 2

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Question : 8
Total: 11
What is meant by isomers? Draw the structures of two isomers of butane, C4H10. Explain why we cannot have isomers of first three members of alkane series
Solution:  
Isomers are compounds which have the same molecular formula but different structures.
H−
H
|
C
|
H
−
H
|
C
|
H
−
H
|
C
|
H
−
H
|
C
|
H
−H
‌
n- butane
  
H−
H
|
C
|
H
−
H
|
C
|
H−
C
|
H
−H
−
H
|
C
|
H
−H
Iso butane
Since branching is not possible in first 3 members thus isomers of these first members of alkane series is not possible.
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