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The correct IUPAC name of the above given compound is:

1. 2-epoxy-1-chloropropane
2. 1,2-epoxy-1-chloropropane
3. epoxy-1-chloropropane
4. 3-Chloro-1,2-epoxypropane

Correct answer: 1,2-epoxy-1-chloropropane

Solution

The parent chain is propane, and the epoxide ring spans carbons 1 and 2, so the correct prefix is 1,2-epoxy. Chlorine is attached to carbon 1, giving 1,2-epoxy-1-chloropropane. This matches the lowest-locant rule and the proper way to name an epoxide as a substituent.

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