Which of the following is a carbohydrate?

The compound which does not contain an asymmetric carbon atom is

Glucose and gluconic acid on oxidation with dilute nitric acid $(HNO_3)$ form saccharic acid. This reaction confirms that glucose contains:

The units of monosaccharide present in raffinose are

Consider the following reactions:
$(i)$ $\text{Glucose} + ROH$ $\xrightarrow{\text{dry } HCl} \text{Acetal}$ $\xrightarrow{x \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$(ii)$ $\text{Glucose}$ $\xrightarrow{Ni/H_2} A$ $\xrightarrow{y \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$(iii)$ $\text{Glucose} \xrightarrow{z \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$x, y$ and $z$ in these reactions are respectively:

Which carbohydrate is present in the liver?