MCQ
Among ethanol, dimethyl ether, methanol and propanal, the isomers are:
  • A
    Ethanol, dimethyl ether, methanol and propanal
  • B
    Ethanol and methanol
  • C
    Ethanol, dimethyl ether, and methanol
  • Ethanol and dimethyl ether

Answer

Correct option: D.
Ethanol and dimethyl ether
Ethanol $\left(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}\right)$ and dimethyl ether $\left(\mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_3\right)$ have same molecular formula but different functional groups, so they are isomers.

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