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

Which of the following structures contains a secondary (2°) amine?
Transcript text: Which of the following structures contains a secondary $\left(2^{\circ}\right)$ amine?
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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 cyclic structure with no nitrogen.
  • Structure III: A cyclic structure with an NH group.
  • Structure IV: Contains an NH₂ group attached to a carbonyl 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).
  • Structure II: No nitrogen present.
  • Structure III: Secondary amine (NH group with two carbon substituents).
  • Structure IV: Primary amine (NH₂ group attached to a carbonyl group).

Final Answer

The structure that contains a secondary (2°) amine is:

  • III
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