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Dextrose is...

Dextrose is

A

`L-(-)-` glucose

B

`D-(+)-` glucose

C

`D-(-)-` fructose

D

`L-(+)-` fructose

Text Solution

Verified by Experts

The correct Answer is:
B

Naturally occuring glucose, which is `D - (+) -` glucose, is called dextrose because it is dextrorotatory.
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Assertion : Glucose is dextrose Reason : the open chains of glucose have four asymmettrical carbon .

Cane sugar is gradualaly converted into dextrose and laevuloe by dilute acid. The rate of inversion is observed by measuring the polarisation angle, at various times, when the following results are obtained: {:("Time (min)",0,10,20,30,40,100,oo),("Angle",32.4,28.8,25.5,22.4,19.6,-6.1,-14.1):} Show that the reaction is of first order. Calculate the value of t, when the solution is optically inactive.