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How many structural isomers of ethers have the molecular formula C4H10O? (Exclude stereoisomers and alcohol structures.)

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

For C4H10O ethers (R-O-R'), the alkyl groups must together have 4 carbons: (C2, C2) gives diethyl ether; (C1, C3) gives methyl n-propyl ether; (C1, C3 branched) gives methyl isopropyl ether. No other combinations exist, giving exactly 3 structural isomers.

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