Chapter 13, Problem 13.57P

Treatment of anisole $\left({\text{CH}}_{\text{3}}{\text{OC}}_{\text{6}}{\text{H}}_{\text{5}}\right)$ with ${\text{Cl}}_{\text{2}}$ and ${\text{FeCl}}_{\text{3}}$ forms P, which has peaks in its mass spectrum at $m\text{/}z=142$ $\left(\text{M}\right)$, $144$ $\left(\text{M+2}\right)$, $129$, and $127$. P has absorptions in its IR spectrum at $3096-2837$

(several peaks), $1582$, and ${\text{1494 cm}}^{-1}$. Propose possible structures for P.