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Longest Chain Rule

Which of the ...

Question

Which of the following pair of compounds represents chain isomers?

I and II

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I and III

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I and IV

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II and IV

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Solution

The correct option is B I and II
I and II is the pair of compounds that represents chain isomers. The carbon chain in compound I is branched (straight) and the carbon chain in compound II is branched. Another example of chain isomers is n butyl amine and isobutyl amine. Chain isomers have same molecular formula but different carbon skeleton.

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