Chapter 13.3, Problem 3P

Using $\text{: <mover accent="true"> O <mo> ¨ </mo> </mover> =}\stackrel{\text{+}}{\text{N}}\text{= <mover accent="true"> O <mo> ¨ </mo> </mover> :}$ as the electrophile, write a reasonable mechanism for the reaction given in

Problem $13.2$. Use curved arrows to show the flow of electrons.

Nitration of $\text{1,4-dimethylbenzene}\left(p\text{-xylene}\right)$ gives a single product having the molecular formula ${\text{C}}_8{\text{H}}_9{\text{NO}}_2$ in high yield. What is this product?