State the number of carbon atoms in glyceraldehyde.

Which of the following is an example of a monosaccharide?

$A$ glucose molecule reacts with '$X$' number of molecules of phenylhydrazine to yield osazone. The value of '$X$' is

$A$ carbohydrate is treated with $\alpha$-naphthol and conc. $H_{2}SO_{4}$. What colour will be formed at the junction of two liquids?

In the reaction $Glucose + Fructose \xrightarrow{X} Sucrose$,what type of reaction does '$X$' represent?

Match the following columns correctly and select the correct option:

Column-$I$	Column-$II$
$(1)$ $C_n(H_2O)_m$	$(a)$ Monosaccharide
$(2)$ $C_n(H_2O)_{n-1}$	$(b)$ Polysaccharide
$(3)$ $C_n(H_2O)_n$	$(c)$ Carbohydrate
$(4)$ $n(C_5H_{10}O_5)$	$(d)$ Disaccharide