Which two functional groups are present in a typical carbohydrate?

Which reagent forms a crystalline osazone derivative upon reaction with glucose?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Ketoses give Seliwanoff's test faster than Aldoses.
Reason $(R)$: Ketoses undergo $\beta$-elimination followed by formation of furfural.
In the light of the above statements,choose the correct answer from the options given below:

In $D-glucose$,the letter $D-$ indicates ...........

What are $\alpha - D -$ glucose and $\beta - D -$ glucose to each other?

The reaction of glucose with $CH_3OH$ in the presence of dry $HCl$ yields methyl glucoside,which indicates the presence of a/an .... in glucose.