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NEET UG CHEMISTRY MCQ: BIOMOLECULES
1
Medium
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Analyzing
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Assertion (A) A solution of sucrose in water is dextrorotatory while on hydrolysis in presence of little hydrochloric acid, it becomes laevorotatory.
Reason (R) Sucrose on hydrolysis gives unequal amounts of glucose andfructose as a result of which change in sign of rotation is observed.
Reason (R) Sucrose on hydrolysis gives unequal amounts of glucose andfructose as a result of which change in sign of rotation is observed.
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Correct option: C
If Assertion is true but Reason is false.
Option C (If Assertion is true but Reason is false) is correct because sucrose is dextrorotatory, and upon hydrolysis, it becomes laevorotatory due to the higher negative rotation of fructose compared to the positive rotation of glucose, but the amounts are equimolar.
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