Assertion :Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Reason: Hydrolysis always changes the optical rotation of a compound.

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 C Assertion is correct but Reason is incorrect
Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Sucrose is dextrorotatory but on hydrolysis, it gives equimolar amounts of glucose which is dextrorotatory and fructose which is laevorotatory. Since the laevorotation of fructose (- 92-4°) is much more than dextrorotation of glucose (+ 52-5°), therefore, the resulting solution becomes laevorotatory.
Optical rotation of compound does not depend on hydrolysis.
Hence Assertion is correct but Reason is incorrect.

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