Example Question - syn-propanethial-s-oxide
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Understanding Properties of Sulfide Compound in Onions
The image contains a question about the properties of the sulfide compound released when cutting onions, which causes tearing of the eyes. The text states that peeling onions under running water reduces the problem and asks which statements are true about the sulfide compound. The statements given are: 1. It is soluble in water. 2. It has a low boiling point. 3. It has small and light ions with weak bondings. 4. It is a covalent compound with weak covalent bonds. The correct statements regarding the sulfide compound are: 1. It is soluble in water: This is true. The compound that causes irritation, known as syn-propanethial-S-oxide, is soluble in water, which is why rinsing the onions under water can help reduce the release of the irritating compounds. 2. It has a low boiling point: This is likely to be true. Volatile compounds with low boiling points are typically responsible for the kinds of irritation observed when cutting onions, as they can easily become airborne and come into contact with the eyes. 3. It has small and light ions with weak bondings: This statement is not true. The compound in question is not ionic; rather, it is a small molecule with covalent bonds. 4. It is a covalent compound with weak covalent bonds: This statement is misleading. While it is a covalent compound, the "weak covalent bonds" part is not necessarily correct. The compound is volatile because of its structure, not due to weak covalent bonds. In summary, statements 1 and 2 are the correct ones regarding the properties of the sulfide compound released when cutting onions.
Understanding Sulfide Compounds in Onions
The image contains a question related to chemistry about the sulfide compounds released when cutting onions. The question is as follows: "Cutting onions often causes tearing of the eyes due to the release of a sulfide compound. Peeling them under running water reduces the problem. Which statements are true of the sulfide compound?" 1. It is soluble in water. 2. It has a low boiling point. 3. It has small and light ions with weak bondings. 4. It is a covalent compound with weak covalent bonds. To solve the question, we must use our knowledge of chemistry: 1. The sulfide compound referred to here is likely a form of syn-propanethial-S-oxide, which is a volatile sulfur compound that acts as a lachrymatory agent (causes tears). This substance is soluble in water, which is why rinsing onions under water helps to reduce the irritation. 2. This compound, being volatile, does have a relatively low boiling point, allowing it to reach the eyes in gaseous form. 3. This statement seems to confuse ions with molecules. The sulfide compound released when cutting onions is not ionic; it's a molecule. Onion enzymes facilitate the conversion of sulfur-containing amino acids into this lachrymatory agent. The compound does not contain small and light ions. 4. The compound is indeed covalent, but the term "weak covalent bonds" can be misleading. The covalent bonds in this molecule are strong enough to hold the atoms together but weak enough for the compound to be volatile, enabling the pain response when cutting onions. Based on this information, statements 1 and 2 are true of the sulfide compound released by onions.
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