Illustrated Glossary of Organic Chemistry

Alkylammonium salt: An ammonium salt in which the cation has the general molecular structure (NRxH4-x)+, where x = 1-4.

  
  
  
Methylammonium chloride
An alkylammonium salt

Dimethylammonium bromide
A dialkylammonium salt

Ethyl dimethylammonium fluoride
A trialkylammonium salt

Tetrabenzylammonium acetate
A tetraalkylammonium salt
A quaternary ammonium salt