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Question

Which of the following compounds cannot exhibit chain isomerism?

A
Propane
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B
Butane
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C
Pentane
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D
Hexane
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Solution

The correct option is A Propane
For chain isomerism, there should be more than or equal to 4 carbon atoms, thus propane can't show chain isomerism.

In a molecule such as propane, no matter how you arrange the carbon atoms a new structure cannot be formed i.e. however you number the carbon atoms you will end up with 3 as the total number of carbons.

Option A is correct.

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