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Find the total number of structural isomers of C7H14 that contain only a five-membered ring.

1. 5
2. 6
3. 7
4. 8

Correct answer: 7

Solution

Cyclopentane (C5H10) plus 2 carbon substituents (C2H4) gives C7H14. The 2 extra carbons can be arranged as: one ethyl group (3 positions on ring), two methyl groups on same or different ring carbons (various positions). Systematic counting gives 7 distinct isomers.

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