$\alpha-D-(+)-$Glucose and $\beta-D-(+)-$Glucose are not

What is the molecular formula of glyceraldehyde?

Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six-membered ring compounds) are insoluble in water. Explain.

The correct observation in the following reactions is:
$\text{Sucrose}$ $\xrightarrow[\text{Cleavage (Hydrolysis)}]{\text{Glycosidic bond}} A + B$ $\xrightarrow[\text{reagent}]{\text{Seliwanoff's}} ?$

What is the nature of invert sugar?

Which carbon atoms of $\alpha-D$-glucopyranose and $\beta-D$-fructofuranose respectively are linked together to form the glycosidic linkage in sucrose?