Sure! Let's go through each option and check if the name follows IUPAC rules: --- ### **A: methylcyclooctane** - **Rule:** If there is only one substituent, you do not need to number its position on the ring, as all positions are equivalent. - **Status:** **Correct** --- ### **B: 2-ethylcyclopropane** - **Rule:** For a cycloalkane with only one substituent, numbering is unnecessary. The substituent should be at position 1, and if you have a “2-ethylcyclopropane,” it implies a second possible position, which is incorrect. - **Status:** **Incorrect** - The correct name should be **ethylcyclopropane**. --- ### **C: 1-ethyl-3,4-dimethylcycloheptane** - **Rule:** When naming, the substituent that comes first alphabetically gets the lowest possible number. Here, “ethyl” (E) comes before “methyl” (M), so ethyl should be at position 1, which is the case. - **Status:** **Correct** --- ### **D: 1,2-dimethylcycloethane** - **Rule:** “Cycloethane” doesn't exist because two carbons can't form a stable ring. The smallest cycloalkane is cyclopropane. - **Status:** **Incorrect** - The correct compound does not exist. --- ### **E: 1-tert-butyl-4-methylcyclopropane** - **Rule:** In cyclopropane, the ring only has 3 carbons. You cannot have substituents on carbons 1 and 4 because there is no carbon 4. - **Status:** **Incorrect** - The highest position is 3. --- ### **F: 1-isopropyl-2,2-dimethylcyclohexane** - **Rule:** The naming and numbering are correct here. Isopropyl gets position 1 (alphabetically before methyl), and the two methyls are on carbon 2. - **Status:** **Correct** --- ## **Summary Table** | Option | Correct/Incorrect | Reason | |--------|-------------------|--------| | A | Correct | Single substituent, no numbering needed | | B | **Incorrect** | Unnecessary numbering for single substituent | | C | Correct | Alphabetical order and numbering followed | | D | **Incorrect** | Cycloethane does not exist | | E | **Incorrect** | Cyclopropane has only 3 carbons, can't have a 4th position | | F | Correct | Naming and numbering are correct | --- ### **Incorrectly Named: B, D, and E** If you have more questions about IUPAC rules or naming, let me know!