The boiling point trend for amines of similar molecular weight is:
For similar molecular weights, primary > secondary > tertiary due to decreasing hydrogen bonding, as per the PDF’s physical properties (e.g., CH₃CH₂NH₂ > (CH₃)₂NH > (CH₃)₃N).
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1