Which of the following is a trisaccharide?

Which one of the following compounds will form an osazone derivative?

What is the number of stereoisomers for $D$-glucose ($6$ carbon sugar)?

Which of the following is a carbohydrate?

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.

Among the three compounds shown below,two yield the same product on reaction with warm $HNO_3$. The exception is: