Assertion :Butanol and 2-methylpropanol are chain isomers. Reason: They differ in the length of carbon chain.

Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.

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Both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion.

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Assertion is CORRECT, but reason is INCORRECT.

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Assertion is INCORRECT, but reason is CORRECT.

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Solution

The correct option is A Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion.
Butanol ( $C H_{3} - C H_{2} - C H_{2} - C H_{2} O H$ ) is a straight chain hydrocarbon whereas 2-methylpropanol ( $C H_{3} - C H_{2} (C H_{3}) - C H_{2} O H$ ) is a branched chain hydrocarbon, thus they differ in the length of the parent carbon chain.

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Choose the correct option.

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