Identify the major P in the following two-step reaction: -50°C P · ABC26OR0451
Subject: Organic Chemistry · Chapter: Heterocyclic Compounds · Topic: Heterocyclic Compounds – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
Identify the major P in the following two-step reaction: 
$-50^{\circ}\mathrm{C}$ $\mathrm{P}$
$-50^{\circ}\mathrm{C}$ $\mathrm{P}$(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Trichloroacetyl chloride acylates pyrrole at C-2; the acyl group deactivates the ring and directs nitration (90 % HNO₃, −50 °C) to C-4, giving 2-trichloroacetyl-4-nitropyrrole (b).
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