Q.

Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevorotatory.

Reason: Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

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a

Assertion is true and reason is false

b

Both assertion and reason are true and reason is correct explanation of assertion

c

Both assertion and reason are true but reason is not correct explanation of assertion

d

Assertion is false and reason is true

answer is C.

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Detailed Solution

Sucrose on hydrolysis gives equal amounts of glucose & fructose but laevorotation of fructose (-92.4º) is more than dextrorotation of glucose (+52.5º) 

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