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Which chemical compound causes tears when an onion is sliced?

sulphuric acid

Syn-Propanethial-S-oxide

nitric acid

None of these

Explanation:

Ans(2) - Syn-Propanethial-S-oxide

When an onion is sliced the onion's cells release syn-Propanethial-S-oxide which stimulates the eyes’ lachrymal glands to release tear. “Sunions” are tearless sweet onions which are increasingly available in markets of USA and UK. These onions are produced by breeding a variety of onions by which, the chemicals responsible for inducing tears diminish over a period of time.

By: Brijesh Kumar

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