Ethanol and dimethyl ether both have the molecular formula C2H6O. They are
Correct answer: D. functional group isomers
- A. position isomers
- B. chain isomers
- C. optical isomers
- D. functional group isomers
Explanation
Ethanol contains a hydroxyl group while dimethyl ether contains an oxygen bridging two carbons, so the functional group itself differs and the two compounds behave completely differently, ethanol boiling at 78 degrees Celsius against minus 25 for the ether. That large difference is due to hydrogen bonding, which the ether cannot do. Aldehydes with ketones and acids with esters are the other standard pairs.
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About Isomerism
Isomerism occurs when compounds have the same molecular formula but different atom arrangements or spatial orientations. The content includes chain, position, functional, metameric and tautomeric isomerism, along with geometrical and optical isomerism, including cis-trans forms, E/Z notation, chirality and enantiomers.
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