1.

Which one of the following statements is not true regarding (+) - Lactose?

Answer»

`(+) -` Lactose, `C_(12) H_(22) O_(11)`, contains `8 - OH` groups
On hydrolysis, `(+) -` Lactose gives equal AMOUNT of `D- (+) -` glucose and `D- (+) -` galactose
`(+) -` Lactose is a `beta`-glycoside formed by the union of a molecule of `D - (+) -` glucose and a molecule of `D- (+) -` galactose
`(+) -` Lactose is a reducing sugar and does not exhibit MUTAROTATION

Solution :`(+)-` Lactose `(C_(12) H_(22) O_(11))` is a reducing sugar, forms an osazone, and exists in alpha and beta forms which undergo mutarotation. In FACT all reducing sugars undergo mutarotation.
Acidic hydrolysis or treatment with emulsin (which splits `beta`- linkage only) converts `(+)-` lactose into equal amounts of `D-(+)-` gluose and `D-(+)-` glucose.


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