Question

Cut the onion why come tears My eyes.

Answer 1

Onions releases a gas called Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulfur gas. These gases then get to your eyes and create a mild acid which irritates the eyes.

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Answer 2

HeY FriENd HeRe is YoUR AnsWEr :-
Due to presence of sulfenic acid tears come while cutting onion.