Which amine has the highest solubility in water per carbon atom?
Methylamine (CH₃NH₂, 1C) has two N-H bonds for hydrogen bonding relative to one carbon, giving the highest solubility per carbon, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1