JEE Main 2025 Jan 24 Shift 2, Chemistry Q14: Resonance & Mesomeric Effect

JEE Main2025Jan 24, Shift 2Chemistry

Identify correct statement/s :

(A) $- O C H_{3}$ and $- N H C O C H_{3}$ are activating group

(B) $- C N$ and $- O H$ are meta directing group

(D) Activating groups act as ortho – and para directing groups

(E) Halides are activating groups

Choose the correct answer from the options given below :

Solution

Evaluating each statement:

(A) $- O C H_{3}$ and $- N H C O C H_{3}$ both donate electrons by resonance (lone pair on O / N) and are activating. Correct.
(B) $- C N$ is meta-directing (electron-withdrawing by resonance), but $- O H$ is a strong ortho/para-director. Incorrect.
(C) Both $- C N$ and $- S O_{3} H$ withdraw electrons by resonance / induction and are meta-directing. Correct.
(D) All activating groups direct incoming electrophiles to ortho and para positions. Correct.
(E) Halides are an exception: they are weakly deactivating yet still ortho/para-directing. Incorrect.

Correct statements: (A), (C), (D).

Correct option: (1)

Concept behind this question

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