Assertion :When the ketohexose, D() fructose is treated with phenyl hydrazine it produces an osazone that is identical with the one prepared from either D-(+) glucose or D-(+) mannose. Reason: Sugars forming same osazone have different configuration $C_{1}$ and $C_{2}$ that are involved in osazone formation, the rest four carbon atoms ( $C_{3}, C_{4}, C_{5} a n d C_{6}$ are same) are identical. Since all belongs to D-Family hence the configuration of last but one asymmetric carbon atom would be the same

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sugars forming same osazone have different configuration $C_{1}$ and $C_{2}$ that are involved in osazone formation, the rest four carbon atoms ( $C_{3}, C_{4}, C_{5}, a n d C_{6}$ are same) are identical. Since all belongs to D-Family hence the configuration of last but one asymmetric carbon atom would be the same.
Hence, option A is correct

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