Question

Which of the following pair of compounds are not isomers?

• A. propyne and cyclopropene
• B. propyne and propadiene
• C. propene and cyclopropene
• D. 1-propanol and methoxyethane

Answer 1

The correct option is C propene and cyclopropene

A. Propyne and cyclopropene are ring chain isomers, as one isomer possesses an open chain structure while other has cyclic structure.
B. Propyne and propadiene (allene) are functional isomers.
C. Propene and cyclopropene are not isomers as they differ in their molecular formula.
D. 1-Propanol and methoxyethane have the same molecular formula but different functional groups (alcoholic and ether), so they are functional isomers.