Question

Identify the position where electrophilic aromatic substitution $\left(EAS\right)$ is most favourable.

• A. $A$
• B. $B$
• C. $C$
• D. $A\text{and}C$

Answer 1

The correct option is B $B$

Both $-NHCOC{H}_3$ and $-C{H}_3$ are activating groups.
But since, $-NHCOC{H}_3$ is a stronger activating groupt with respect to $-C{H}_3$.
$\therefore$ electrophile will attack on para and ortho w.r.t $-NHCOC{H}_3$.
Hence ESR will be most favourable at the para position to $-NHCOC{H}_3$ i.e., position (B).