Questions: Which of the following structures contains a secondary (2°) amine? I II III IV

Which of the following structures contains a secondary (2°) amine? I II III IV
Transcript text: Which of the following structures contains a secondary $\left(2^{\circ}\right)$ amine? I II III IV
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Solution

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Solution Steps

Step 1: Identify the structures
  • Structure I: Contains an NH₂ group attached to a carbon chain.
  • Structure II: A cyclopentane ring with no nitrogen.
  • Structure III: A cyclopentane ring with an NH group.
  • Structure IV: Contains a carbonyl group (C=O) and an NH₂ group.
Step 2: Define a secondary (2°) amine

A secondary amine has two organic substituents (alkyl or aryl groups) attached to the nitrogen atom, along with one hydrogen atom.

Step 3: Analyze each structure
  • Structure I: Primary amine (NH₂ group attached to one carbon).
  • Structure II: No nitrogen present.
  • Structure III: Secondary amine (NH group attached to two carbons in the ring).
  • Structure IV: Primary amine (NH₂ group attached to one carbon).

Final Answer

Structure III contains a secondary (2°) amine.

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