Question

On heating to $200^{\circ} \mathrm{C}, \mathrm{H}_2 \mathrm{~N}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-$ COOH gives FIGURE CAN'T COPY.

   On heating to $200^{\circ} \mathrm{C}, \mathrm{H}_2 \mathrm{~N}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-$ COOH gives FIGURE CAN'T COPY. 

A Complete Resource Book in Chemistry for JEE Main 2018
A Complete Resource Book in Chemistry for JEE Main 2018
A.K. Singhal 3rd Edition
Chapter 31, Problem 140 ↓

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This is a linear amino acid with an amine group (NH₂) at one end and a carboxylic acid group (COOH) at the other end.  Show more…

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On heating to $200^{\circ} \mathrm{C}, \mathrm{H}_2 \mathrm{~N}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-$ COOH gives FIGURE CAN'T COPY.
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Key Concepts

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Nucleophilic Acyl Substitution
This mechanism is pivotal in many organic reactions, wherein a nucleophile (such as an amino group) attacks an electrophilic carbonyl carbon. In the context of cyclization, the reaction leads to the substitution of a leaving group (commonly water) and formation of a new bond within the same molecule, driving the formation of cyclic amides.
Intramolecular Cyclization
This concept involves a reaction where a functional group within a molecule reacts with another site on the same molecule to form a ring. It is a common strategy in organic synthesis where the proximity of reactive groups facilitates ring closure, often under thermal conditions.
Lactam Formation
Lactams are cyclic amides formed typically by the intramolecular reaction of an amino group with a carboxyl group. The process involves the nucleophilic attack of the nitrogen on the electrophilic carbonyl carbon, followed by the elimination of water, resulting in a closed-ring structure that is often thermodynamically stable.

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