IPA: //sʌlfəˈneɪʃən//
KK: /sʌlfoʊˈneɪʃən/
The process of adding a sulfonic acid group to an organic compound, which involves replacing a hydrogen atom with a sulfonic acid group, usually through a reaction with sulfuric acid.
The sulfonation of benzene produces sulfonic acid derivatives that are useful in various chemical applications.
Sulfonation is formed from "sulfon-" (derived from "sulfur" which comes from Latin "sulfurium", meaning sulfur) and "-ation" (a suffix used to indicate a process or action). The word refers to the process of introducing a sulfonyl group into a compound, typically in organic chemistry.
Think of 'sulfur' as the key element involved in the process, and remember that 'sulfonation' is the action of adding sulfur to a compound.