JEE Mains 2020 Model Paper 1 New Pattern

Concept:In phenol derivatives, the $-\mathrm{OH}$ group is the principal functional group, so the carbon attached to $-\mathrm{OH}$ is numbered as position $1$.Explanation:The given structure is a benzene ring with an $-\mathrm{OH}$ group and two $-\mathrm{CH}_3$ groups.Numbering from the $-\mathrm{OH}$ carbon, the two methyl groups are located at positions $3$ and $4$.Hence, the IUPAC name is $3,4$-dimethylphenol.Answer:$3,4$-dimethylphenol (Option D).