Question

why do we cry if we cut a onion

Answer 1

Because when we cut a onions it release sulpher in air as a reasult sulpher react with air to form syn - propantehial s oxide and this enter in our eye and form H2SO4 and water which active sensory neuron

Answer 2

we cry while cutting an onion because they produce a chemical irritant known as syn-propanethial -S-oxide which makes use to cry.
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