JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Hydrocarbons

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"✓ Correct

Answer: (D)

Solution

The right-hand ring carries an

- NH - CO -

(anilide) nitrogen whose lone pair is donated into that ring, directing electrophiles to its ortho and para positions. The left-hand ring bears the carbonyl,

- CO - NH -

, an electron-withdrawing group that deactivates it, so substitution is confined to the nitrogen-bearing ring. Among its activated sites the para position marked u is free and sterically unhindered, making it the predominant site of electrophilic attack.

JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Single correct option

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