Question #43951

Compound \textbf{X}, methyl 4-acetylbenzoate, is reacted with one equivalent of aniline ($\ce{PhNH2}$) under three distinct sets of conditions to yield the major organic equilibrium products \textbf{P}, \textbf{Q}, and \textbf{R} respectively (excluding aniline derivatives if unreacted or protonated):

\begin{itemize} \item \textbf{Condition I:} Anhydrous $\ce{MgSO4}$, catalytic $\ce{CH3COOH}$ (pH $\approx$ 4.5), 298 K $\rightarrow$ \textbf{P} \item \textbf{Condition II:} Excess $\ce{H2O}$, dilute aqueous $\ce{HCl}$ (pH = 1.0), 373 K $\rightarrow$ \textbf{Q} \item \textbf{Condition III:} Excess $\ce{H2O}$, aqueous acetate buffer (pH = 4.5), 298 K $\rightarrow$ \textbf{R} \end{itemize}

Identify \textbf{P}, \textbf{Q}, and \textbf{R}.