The major product ‘ P ’ formed in the given reaction is

Friedel-Crafts Alkylation refers to the replacement of an aromatic proton with an alkyl group. This is done through an electrophilic attack on the aromatic ring with the help of a carbocation generated from the alkyl halide and Lewis acid aluminium chloride. In the given case ring closure reaction takes place and ${\mathrm{OCH}}_3$ is ortho/para directing, major product will be obtained from para attack.