Assertion : The specific rotation of a freshly prepared solution of alpha-glucose decreases from + 112^(@) to 52.7^(@) while that of beta glucose increases from +19^(@) to 52.7^(@) . Reason: The change in specific rotation of an optically active compound with time to an equilibrium value is called mutarotation.

Assertion : The specific rotation of a freshly prepared solution of al

1.	Assertion : The specific rotation of a freshly prepared solution of alpha-glucose decreases from + 112^(@) to 52.7^(@) while that of beta glucose increases from +19^(@) to 52.7^(@) . Reason: The change in specific rotation of an optically active compound with time to an equilibrium value is called mutarotation.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are truebut reason is not the correct explanation of the assertion. If assertion is true but reason is false if the assertion and reason both are false Solution :Glucose EXISTS in two forms, i.e `alpha`-D-glucose with a specific of `+19^(@)`. HOWEVER, when either or these two forms is dissolved in water and ALLOWED to stand. It gets converted into the same EQUILIBRIUM mixture of both the `alpha`-and `beta`-forms with a small amount of open chain FORM `+112^(@)` to `52.7^(@)` while that of `beta` glucose increases from `+19^(@)` to `52.7^(@)`.