Glucose $\xrightarrow{Br_2 \, \text{water}} (A)$. Product $(A)$ will be

For osazone formation,the effective structural unit necessary is:

Which of the following is correct?
Pentaacetate of glucose $\xrightarrow{\text{Tollen's reagent}} +ve$ test $(A)$
Pentaacetate of glucose $\xrightarrow{\text{Benedict's reagent}} +ve$ test $(B)$
Pentaacetate of glucose $\xrightarrow{\text{Schiff's reagent}} -ve$ test $(C)$
Pentaacetate of glucose $\xrightarrow{NaHSO_3} -ve$ test $(D)$

Rochelle salt is a dimetal salt of:

$A$ molecule of glucose reacts with $X$ molecules of phenylhydrazine to form osazone. Determine the value of $X$.

Which of the following is $NOT$ a disaccharide?