The general formula for carbohydrates is:

Which of the following statements is $NOT$ correct?

Ribose and $2$-deoxyribose can be differentiated by

$ \alpha-D-Glucose $ and $ \beta-D-Glucose $ are:

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

From the following,the correct statements about polysaccharides are:
$(I)$ Starch is a polymer of $\alpha-D(+)$-glucose.
$(II)$ Amylose component of starch is not soluble in water.
$(III)$ Amylose is a branched chain polymer of $\alpha-D(+)$-glucose.
$(IV)$ Cellulose is a straight chain polymer of $\beta-D(+)$-glucose units.