Sucrose is dextrorotatory but after hydrolysi | vedclass

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Question

(D) Sucrose is a disaccharide that is dextrorotatory $(+66.5^{\circ})$. Upon hydrolysis,it yields an equimolar mixture of $D-(+)$-glucose and $D-(-)$-

Vedclass · Accepted Answer

laevorotation of fructose is more than dextrorotation of glucose.

Vedclass · Answer

(D) Sucrose is a disaccharide that is dextrorotatory $(+66.5^{\circ})$. Upon hydrolysis,it yields an equimolar mixture of $D-(+)$-glucose and $D-(-)$-fructose. The specific rotation of $D-(+)$-glucose is $+52.5^{\circ}$,while the specific rotation of $D-(-)$-fructose is $-92.4^{\circ}$. Since the magnitude of the laevorotation of fructose $(-92.4^{\circ})$ is greater than the magnitude of the dextrorotation of glucose $(+52.5^{\circ})$,the resulting mixture is laevorotatory. Therefore,the correct reason is that the laevorotation of fructose is more than the dextrorotation of glucose.

Sucrose is dextrorotatory but after hydrolysis the mixture shows laevorotation,this is because of

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