Question

For the given molecule \(X\), the preferred site for the attack of the electrophile is:

• A. Predominantly at \(r\)
• B. \(r\) and \(u\)
• C. \(p\) and \(s\)
• D. Predominantly at \(u\)

Answer 1

The Correct Option is C

Concept: Electrophilic aromatic substitution occurs preferentially at positions activated by electron donating groups. The substituent present is an amide linkage: \[ -CO-NH- \] The \(-NH-\) group donates electron density to the aromatic ring by resonance, activating ortho and para positions.
Step 1:Analyze substituent effects} The carbonyl group withdraws electron density from the first ring, making it less reactive. However the \(-NH-\) group donates electron density into the second ring.
Step 2:Determine activated positions} Thus electrophilic substitution occurs mainly at the ortho and para positions of the activated ring. These correspond to: \[ p \quad \text{and} \quad s \] \[ \boxed{p \text{ and } s} \]