Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C4H8O is:

Question

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C4H8O is:

1. A. 6
2. B. 8
3. C. 10 (Correct answer)
4. D. 11

Correct Answer

Option C — 10

Detailed Solution & Explanation

The correct answer is 10.

Key Points

• Cyclic ethers of C$_4$H$_8$O keep the O in the ring; counting each ring skeleton and its stereoisomers:
• Oxetane rings (4-membered) and oxolane/methyl-substituted variants that contain a chiral carbon each contribute a d,l pair (2), while symmetric ones contribute 1.
• Adding the contributions: $2+1+1+1+2+1+2=10$ distinct isomers.