The major product of the following reaction is:

 This is electrophilic substitution reaction which is determine by electronic effect of $\mathrm{OH}\backslash {\mathrm{CH}}_3\backslash {\mathrm{NO}}_2$.

Electrophilic attacks in influence of activating group $-\mathrm{OH}$ so it is attached at para position with respect to $-\mathrm{OH}$ group.