$$ \begin{aligned} &\text { What is the major product }\left[\mathrm{P}_3\right] \text { formed when } n \text { - Hexane undergoes the given series of reactions: }\\ &\begin{aligned} \text { n-Hexane } & \frac{\mathrm{V}_2 \mathrm{O}_5}{20 \mathrm{~atm}, 773 \mathrm{k}}\left[\mathrm{P}_1\right] \\ {\left[\mathrm{P}_1\right] } & \xrightarrow[\triangle]{\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}, \text { Anhyd.AlCl }}\left[\mathrm{P}_2\right] \\ {\left[\mathrm{P}_2\right] } & \xrightarrow[333 \mathrm{~K}]{\text { Conc. } \mathrm{HNO}_3+\mathrm{H}_2 \mathrm{SO}_4}\left[\mathrm{P}_3\right] \text { Major product } \end{aligned} \end{aligned} $$

The statements given below contains assertion and reason. Choose the correct option

Assertion (A): Propene reacts with HBr in presence of organic peroxide gives 1-bromopropane.

Reason(R): The reaction occurs through carbocation intermediate

A compound with molecular formula $\mathrm{C}_5 \mathrm{H}_{10}$ that gives acetone on ozonolysis is:

$$ \text { The decreasing order of reactivity towards electrophilic substitutions is: } $$