Which reagent among the following is used to confirm the presence of an aldehydic carbonyl group in glucose?

Glucose and Fructose are .......

Which of the following statements are true about carbohydrates?
$(i)$ Monosaccharides can be hydrolysed.
$(ii)$ The two monosaccharide units obtained on hydrolysis of a disaccharide can either be same or different.
$(iii)$ Polysaccharides are non-sweet in taste.
$(iv)$ All monosaccharides are not reducing sugars.

$D-(+)$-glucose reacts with hydroxylamine $(NH_2OH)$ to yield an oxime. The structure of the oxime is:

Glucose and fructose are

Which of the following is a non-reducing sugar?