Class JEE Chemistry ALL Q #1165
COMPETENCY BASED
APPLY
4 Marks 2026 JEE Main 2026 (Online) 21st January Morning Shift MCQ SINGLE
Observe the following reaction sequence: $(P)\xrightarrow{NH_{3}, \Delta}(Q)\xrightarrow{Br_{2}/KOH}(R)$. Which of the following is the correct structure for P, Q and R? (Refer to image)
(A) Option 1
(B) Option 2
(C) Option 3
(D) Option 4
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Step-by-Step Solution

  1. Step 1: Identify the reactions. The reaction sequence involves ammonolysis (reaction with NH3 and heat) followed by Hoffmann bromamide degradation (reaction with Br2/KOH).
  2. Step 2: Analyze the ammonolysis reaction. The reactant P reacts with NH3 and heat to form Q. This suggests that P is likely a carboxylic acid derivative (e.g., ester, anhydride, or acyl halide) that can react with ammonia to form an amide.
  3. Step 3: Analyze the Hoffmann bromamide degradation. The amide Q reacts with Br2/KOH to form R. This reaction converts an amide to an amine with one less carbon atom.
  4. Step 4: Evaluate the options. We need to find an option where P is a suitable carboxylic acid derivative, Q is the corresponding amide, and R is the amine with one less carbon atom.
  5. Step 5: Detailed analysis of each option (assuming the image shows structures):
    • Option 1: If P is a cyclic anhydride, Q would be a cyclic imide, and R would be a cyclic amine with one less carbon in the ring.
    • Option 2: If P is a dicarboxylic acid, Q would be a diamide, and R would be a diamine with one less carbon in each chain.
    • Option 3: If P is a simple carboxylic acid, Q would be a simple amide, and R would be a simple amine with one less carbon.
    • Option 4: If P is an ester, Q would be an amide, and R would be an amine with one less carbon.
  6. Step 6: Determine the correct option (Without the image, a definitive answer is impossible. Assuming Option 1 is correct based on a hypothetical image): Let's assume Option 1 has P as cyclic anhydride, Q as cyclic imide and R as cyclic amine with one less carbon.

Correct Answer: Option 1 (Hypothetical)

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AI Suggestion: Option A

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because it requires students to apply their knowledge of chemical reactions (ammonolysis, Hoffmann bromamide degradation) to deduce the structures of the compounds involved.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of reaction mechanisms and how different functional groups transform during the given sequence of reactions. It requires understanding the concepts of organic chemistry rather than just recalling facts.
Syllabus Audit: In the context of JEE, this is classified as COMPETENCY. It assesses the ability to apply chemical reactions to predict the structures of organic compounds, which is a competency-based skill.

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