$\mathrm{\alpha }-\mathrm{D}$-Glucopyranose and $\mathrm{\beta }-\mathrm{D}$-Glucopyranose are:

Consider the following structures.

Which of the following pairs represent $\mathrm{D}$ and $\mathrm{L}$ fructose respectively?

Methyl $\mathrm{D}$-glucoside on reaction with ${\mathrm{HIO}}_4$ consume two moles of the reagent and produces the dialdehyde $\left(\mathrm{A}\right)$ and one mole of $\mathrm{HCOOH}$

${\mathrm{HOCH}}_2\mathrm{-}\underset{\stackrel{|}{\mathrm{CHO}}}{\mathrm{CH}}-\mathrm{O}-\underset{\stackrel{|}{\mathrm{CHO}}}{\mathrm{CH}}-{\mathrm{OCH}}_{\mathrm{3}}$

The result of this reaction proves that glucose has:

Following are the structure of $\mathrm{D}-$glucose and $\mathrm{D}$-galactose

Which of the statement is correct about these compounds: