In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of these statements, mark the correct answer.

Assertion – n-butane and iso-butane are examples of structural isomers.

Reason – Isomerism is possible only with hydrocarbons having 4 or more carbon atoms.

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Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

The assertion is true but the Reason is false

The assertion is false but the Reason is true

answer is B.

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Detailed Solution

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
Assertion: The organic compounds with the same molecular formula but different chemical and physical properties known as isomers and the phenomenon is termed isomerism. Some compounds have the same molecular formula but different structures.
Reason: Such compounds are called structural isomers and the phenomenon is called structural isomerism. n-butane (C4H10) and iso-butane (C4H10) are structural isomers with the same molecular formula but different structural formulas. A minimum of four carbon atoms are required for a hydrocarbon to form a branched compound.

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