Question

why if we cut an onion and after our eyes get tears ?​

Answer 1

Answer:

When an onion is sliced or diced, the onion's cells release these compounds into the air. When this occurs, "enzyme" works to alter the amino acids into lachrymator compounds. This form of sulfuric acid irritates the nerves around the eyes making them tear.

Explanation:

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Answer 2

Because Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion. ... The synthase enzyme converts the amino acids sulfoxides of the onion into sulfenic acid.