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ChemistryNEET 2025Isomerism: structural and stereo

Organic Chemistry: Some Basic Principles and Techniques

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

  1. A.6
  2. B.8
  3. C.10✓
  4. D.11

Solution

Six structural isomers: oxolane (THF), 2-methyloxetane, 3-methyloxetane, 2-ethyloxirane, 2,2-dimethyloxirane and 2,3-dimethyloxirane. Adding stereoisomers: 2-methyloxetane and 2-ethyloxirane are each a pair of enantiomers, and 2,3-dimethyloxirane exists as the cis (meso) form plus a trans pair. Total .

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