What is the product formed by the reaction of cane sugar with concentrated nitric acid?

The correct set$(s)$ of reactions to synthesize benzoic acid starting from benzene is/are:

Identify the method by which $Me_{3}CCOOH$ can be prepared.

Find product $V$ in the following reaction sequence:
$CH_3-CH(CH_3)-COOH$ $\xrightarrow[H_3O^{+}]{LiAlH_4} I$ $\xrightarrow{PBr_3} II$ $\xrightarrow[ether]{Mg} III$ $\xrightarrow{CO_2} IV$ $\xrightarrow{H_3O^{+}} V$

Identify the product formed in the following reaction.
$C_6H_5-CH_2-CH_3 \xrightarrow[\text{ii) } H_3O^{+}]{\text{alk. } KMnO_4} \text{product}$

Grignard reagent $RMgBr$ $(P)$ reacts with water and forms a gas $(Q)$. One gram of $Q$ occupies $1.4 \ dm^3$ at $STP$. $(P)$ on reaction with dry ice in dry ether followed by $H_3O^{+}$ forms a compound $(Z)$. $0.1 \ mole$ of $(Z)$ will weigh . . . . . . $g$. (Nearest integer)