Assertion :The locant (2.8.7) is preferred over the locant (3.4.9) Reason: Lowest locant number at first difference is preferred

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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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 for Assertion
The principal functional group are assigned the lowest possible locant. The lowest locant number at first difference is preferred. For example, the locant (2.8.7) is preferred over the locant (3.4.9).

Therefore, option (A) is correct.

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