Glucose gives a silver mirror with Tollen's reagent. It shows the presence of:

Which of the molecules below will react with $Ag^{+}$ (Tollens' reagent)?

Only two carbon atoms of glucose participate in the formation of osazone because they undergo .......

Which of the following carbohydrates has a glycosidic linkage?

The number of possible stereoisomers for glucose is .......... .

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: