What chemical compound, released when onions are cut, causes irritation to the eyes and leads to tears?
✓ Correct Answer: Option C
When an onion is cut, cells are broken, releasing enzymes that react with amino acid sulfoxides to produce sulfenic acids. These then spontaneously rearrange to form syn-propanethial S-oxide, a volatile sulfur compound that irritates the lacrimal glands of the eyes, causing tears.
📚 About This Everyday Science Practice Question
This 2-level Everyday Science question from the Food & Nutrition topic is part of One Paper Preparation's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.
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