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Question
Which of the following is/are chain isomer(s) of hexane?
Which of the following is/are chain isomer(s) of hexane?
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Solution
The correct options are
A
B
C
Chain, nuclear or skeleton isomerism: This type of isomerism is due to the difference in the nature of the carbon chain (i.e., straight or branched) which forms the nucleus of the molecule.
What is Hexane?
CH3−CH2−CH2−CH2−CH2−CH3
Now, 
is an isomer (It is the bond line form)
The possible structures with same molecular formula with the only difference in the nature of carbon chain will be:
Hence, only the nature of carbon chain is changing.
But in 
No. of carbons = 5
So, the molecular formula has changed.
A
B
C
Chain, nuclear or skeleton isomerism: This type of isomerism is due to the difference in the nature of the carbon chain (i.e., straight or branched) which forms the nucleus of the molecule.
What is Hexane?
CH3−CH2−CH2−CH2−CH2−CH3
Now, is an isomer (It is the bond line form)
The possible structures with same molecular formula with the only difference in the nature of carbon chain will be:
Hence, only the nature of carbon chain is changing.
But in
No. of carbons = 5
So, the molecular formula has changed.
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