What name is given to a reaction in which one molecule ionises by reacting with another of its own kind?

1. In pure water a few molecules pass protons to other water molecules. 2. The products are the hydronium ion and the hydroxide ion. 3. A reaction between two molecules of the same substance that yields ions is autoionisation. 4. Neutralisation needs a separate acid and base, so it does not describe this case. _Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.1 Brønsted-Lowry Acids and Bases_