Sucrose in water is dextrorotatory, `[alpha]_(D)=+66.4^(@)` when boiled with dil. HCl, the solution becomes leavorotatory , `[alpha]_(D)=-39.9^(@)`,. In this process the sucrose breaks into

Options

A. L-glucose +D-fructose
B. L-glucose+L-fructose
C. D-glucose+D-fructose
D. D-glucose+L-fructose

Answer

C

Explanation

The aqueous solution of sucrose is dextrorotatroy having `[alpha]_(D)=+66.4^(@)`. On hydrolysis with dilute acids or enzyme invertase, can sugar (sucrose) gives equimolar mixture of D-(+)-glucos and D-(-)-fructose
`underset([alpha]_(D)=66.4^(@))underset("cane sugar")(C_(12)H_(22)O_(11))+H_(2)O overset(HCl)tounderset([alpha]_(D)=+52.5)underset("D-glucose")(C_(6)H_(12)O_(6))+underset([alpha]_(D)=-92.4^(@))underset("D-fructose")(C_(6)H_(12)O_(6))`
So, sucrose is dextrorotatory but after hydrolysis gives dextrorotatory glucose and laevorotatory fructose. D-(-)-fructose has a greater specific rotation than D-(+)-glucose. therefore, the resultant solution is laeovorotatory in nature with specific rotation of `-39.9^(@)`.