Question

What is the chemical name of tear gas

Answer 1

the chemical name is lachrymator and mace hope this is helpful for u
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Answer 2

2-chlorobenzalmalononitrile (also called o-chlorobenzylidene malononitrile) (chemical formula: C10H5ClN2) is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent. "CS gas" is actually an aerosol of a volatile solvent (a substance that dissolves other substances and that easily evaporates). 
its formula is C10H5ClN2.