Assertion :Chain isomers shows different skeletons of carbon atom due to branching while keeping the same molecular formula. Because of branching, the linkage of carbon atoms in the parent chain is different which results in different molecules. Reason: Positional isomers have the same functional groups or multiples of them at different positions.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
1. Chain isomerism
This type of isomerism shown in compounds having same molecular formula but different arrangement of atoms in parental chain.
2. Positional isomers
In such type of isomerism, isomers have the same functional groups or multiples of them at different positions, as shown in images.

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