(A): Methane, Ethane and propane do not exhibit chain isomerism.
(R): There must be minimum of four carbon atoms to exhibit chain isomerism

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Bother a and R are true. R is the correct explanation of A

Both A and R are true. R is not correct explanation of A

A is true R is false

A is false R is true

answer is A.

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Detailed Solution

Chain isomerism arises due to difference in the arrangement of carbon atoms constituting the chain.

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