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.

List-$I$ (Glycosidic linkage)	List-$II$ (Polysaccharide)
$A$. $\alpha-1,4$	$I$. Amylose
$B$. $\beta-1,4$	$II$. Cellulose
$C$. $\alpha-1,4, \alpha-1,6$	$III$. Amylopectin

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

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List-$I$ (Glycosidic linkage) List-$II$ (Polysaccharide)
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