Class 12 Chemistry Amines Classification of Amines as Primary, Secondary & Tertiary

Classification of Amines as Primary, Secondary & Tertiary

  • Amines are classified as primary (1o), secondary (2o) and tertiary (3o) depending upon the number of hydrogen atoms replaced by alkyl or aryl groups in ammonia molecule.
  • If one hydrogen atom of ammonia is replaced by R or Ar, we get RNH2 or ArNH2, a primary amine (1o).
  • If two hydrogen atoms of ammonia or one hydrogen atom of R-NH2 are replaced by another alkyl/aryl (R’) group then it is called as secondary amine.
  • The second alkyl/aryl group may be same or different.
  • Replacement of another hydrogen atom by alkyl/aryl group leads to the formation of tertiary amine.

Class_12_Chemistry_Amines_Classification_Of_Amines

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  • Amines are said to be ‘simple’ when all the alkyl or aryl groups are the same, and ‘mixed’ when they are different.

 Class_12_Chemistry_Amines_Classification_Of_Amines2

Problem:-

Classify the following amines as primary, secondary or tertiary:

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Answer:-

  • It is a primary amine because only 1 hydrogen is replaced if we compare this structure with ammonia.
  • It is a tertiary amine as all the 3 hydrogen is replaced.
  • It is a primary amine as only 1 hydrogen is replaced.

 It is a secondary amine as 2 hydrogens are

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