Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C_4H_8O is :

1. 6

2. 8

3. 10

4. 11

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

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Answer: 3. 10

Key idea: list all rings of formula \(\mathrm{C_4H_8O}\) containing O, and count enantiomers/cis-trans.

Oxolane (THF): 1.
Oxetane with a methyl: 2-methyloxetane (chiral) gives 2; 3-methyloxetane gives 1.
Oxirane: 2-ethyloxirane (chiral) gives 2; 2,2-dimethyloxirane gives 1; 2,3-dimethyloxirane gives cis (meso) + trans (2 enantiomers) = 3.

Total = 1 + 3 + 6 = 10: option (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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