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Among the following compounds, which one is a tertiary amine?

easy MCQ 1 mark Class 12 · Chemistry · Amines
  1. Methylamine
  2. Dimethylamine
  3. Trimethylamine
  4. Ethylamine
Answer
Trimethylamine

The correct answer is Trimethylamine — Therefore, the compound with three alkyl groups attached to nitrogen is trimethylamine.

Step-by-step solution

  1. Identify the number of carbon groups directly attached to the nitrogen atom in each option.
  2. Methylamine has one alkyl group, dimethylamine has two, trimethylamine has three, and ethylamine has one.
  3. A tertiary amine is defined as an amine where the nitrogen is bonded to three alkyl or aryl groups.
  4. Therefore, the compound with three alkyl groups attached to nitrogen is trimethylamine.
Common mistake: Confusing secondary amines (two alkyl groups) with tertiary amines (three alkyl groups).

Concept tested: Classification of amines by substitution

Published · How this solution was prepared and checked

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