In a patient's urine test,diabetes can be detected using...........

Which of the following statements is incorrect for glucose?

The aqueous solution of a carbohydrate gives a dark blue colour with iodine. It is

Sucrose is a

Four carbohydrates: glucose,lactose,sucrose,and starch are present. Different tests are carried out with these $4$ carbohydrates separately. The following observations are made:
$(a)$ Heated: It is charred.
$(b)$ $I_2$ solution: No violet colour.
$(c)$ Fehling solution: Reddish brown precipitate is observed.
$(d)$ It does not reduce copper$(II)$ acetate to $Cu_2O$. No red precipitate is observed in $5 \ min$.
Which carbohydrate satisfies all the above observations?

Two monomers in maltose are