Identify Correct Statements About Glucose Anomers Properties and Preparation

To determine the correct statements about the properties and preparation of glucose anomers, let us evaluate each statement individually based on standard chemical facts and NCERT specifications:

1. Statement A: Glucose exists in two anomeric forms.

   • Correct. Glucose exists in two cyclic hemiacetal forms designated as $\alpha$-D-glucose and $\beta$-D-glucose, which are known as anomers.

2. Statement B: Anomers of glucose differ in configuration at C-1 in cyclic hemiacetal structure.

   • Correct. Anomers are a specific type of epimers that differ in spatial configuration only at the hemiacetal/anomeric carbon ($\text{C-1}$).

3. Statement C: Melting point of $\alpha$-anomer of glucose is greater than $\beta$-anomer.

   • Incorrect. The melting point of $\alpha$-D-glucose is $419\text{ K}$ ($146^\circ\text{C}$), whereas the melting point of $\beta$-D-glucose is $423\text{ K}$ ($150^\circ\text{C}$). Therefore, the melting point of the $\beta$-anomer is greater than that of the $\alpha$-anomer.

4. Statement D: Specific rotation of $\alpha$-anomer is $+19^\circ$ while $\beta$-anomer is $+112^\circ$.

   • Incorrect. The specific optical rotation of the $\alpha$-anomer is $+112.2^\circ$ (or $\approx +112^\circ$), while that of the $\beta$-anomer is $+18.7^\circ$ (or $\approx +19^\circ$). The values given in the statement are reversed.

5. Statement E: $\alpha$ and $\beta$-anomers of glucose are prepared by crystallization of saturated glucose solution at $303\text{ K}$ and $371\text{ K}$ respectively.

   • Correct. The $\alpha$-form of glucose is obtained by crystallisation from a concentrated solution of glucose at $303\text{ K}$, while the $\beta$-form is obtained by crystallisation from a hot and saturated aqueous solution at $371\text{ K}$.

Thus, the correct statements are A, B and E Only.

Correct Option: D