Tabun

Tabun
It was invented by a German chemist, Gerhard Schrader, in the mid 1930s.It is a colourless or brownish as a liquid and odorless as a vapor. Schrader worked for IG Farben, a company that later used slave labour from the Birkenau concentration camp to produce its products. Another one of Fraben’s invention was Zyklon-B, a type of hydrogen cyanide used by the Nazis to gas victims in those same camps during World War II. Tabun is also an organophosphate like many pesticides and is among the easiest to nerve gases to manufacture. 
 Chemical Weapons