The compound 2-chlorobenzalmalononitrile (likewise called o-chlorobenzylidene malononitrile), a cyanocarbon, is the characterizing part of poisonous gas usually alluded to as CS gas, which is utilized as a defence in case of riots.
2-chlorobenzalmalononitrile is a hard substance.
It is an aerosol of a volatile solvent
It is a non-lethal gas.
If ever exposed to tear gas, it causes a burning sensation and tearing in the eyes.