Which of the following contains a dextrorotatory sugar?

Glycosidic linkage in carbohydrates is called

What is the total number of carbon atoms present in a sugar molecule of $RNA$ nucleotide?

Sugar which does not give reddish brown precipitate with Fehling's reagent is:

$(i) \ CHO-(CHOH)_3-CH_2OH \xrightarrow{4HIO_4} \text{Product}$
$(ii) \ CH_2OH-(CHOH)_4-CH_2OH \xrightarrow{5HIO_4} \text{Product}$
\text{The ratio of moles of formic acid obtained in reaction } $(i)$ \text{ and reaction } (ii) \text{ is:}

$\alpha - D - (+) -$ glucose and $\beta - D - (+) -$ glucose are: