JEE Advanced 2024 — Paper 2 — Question 34

An organic compound $P$ having molecular formula $\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{3}$ gives ferric chloride test and does not have intramolecular hydrogen bond. The compound $\mathbf{P}$ reacts with 3 equivalents of $\mathrm{NH}_{2} \mathrm{OH}$ to produce oxime $\mathbf{Q}$. Treatment of $\mathbf{P}$ with excess methyl iodide in the presence of KOH produces compound $\mathbf{R}$ as the major product. Reaction of $\mathbf{R}$ with excess iso-butylmagnesium bromide followed by treatment with $\mathrm{H}_{3} \mathrm{O}^{+}$gives compound $\mathbf{S}$ as the major product. The total number of methyl $\left(-\mathrm{CH}_{3}\right)$

group(s) in compound $\mathbf{S}$ is $\qquad$