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The linkage between the two monosacchari...

The linkage between the two monosaccharide units in lactose is _____.

A

`C_1` of `beta`-D - glucose and C4 of `beta-`D - galactose

B

`C_1` of `beta-`D - galactose and C4 of `beta-`D - glucose

C

`C_1` of `beta - D -` galactose and `C_4 ` of `beta - D - ` glucose

D

`C_1` of `alpha-D-` glucose and `C_4` of `alpha-D-` glucose

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The correct Answer is:
B
Properties of ionic solid
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The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage. In disaccharides, if the reducing groups of monosaccharides i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars, e.g., sucrose. On the other hand, sugars in which these functional groups are free, are called reducing sugars, for example, maltose and lactose. A non reducing disaccharide 'A on hydrolysis with dilute acid gives an equimolar mixture of D-(+)glucose and D-(+)-Fructose. What is the mixture of D-(+) glucose and D-(+) fructose known as ?

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