Question

Why does chopping an onion make cry

Answer 1

Whwn you chopp an onion it produces a chemical irritant known as syn-propanenthiol-s-oxide that reacts with other enzyms in the onion to produce sulphur gas which reacts with the eyes and produces a mild acid that irritates the eyes

Answer 2

 a chemical irritant known as syn-propanenthiol-s-oxide that reacts with other enzyms in the onion to produce sulphur gas which make us cry