Identify the pairs of compounds that represents chain isomerism.




I and III,

I and IV,


II and III,


II and IV,


II and IV,


V and VII,


VI and VII


Explanation:


Compounds having same molecular formula but vary in the length of the parent chain(as they are branched) is called chain isomerism. Compound I and II are linear (no branching) while III and IV are branched, so I and II are chain isomers with III and IV. Similarly, VII is ether with a branched alkyl group while V and VI are linear. So, VII is an isomer of both V and VI.


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