Question

Which of the following is NOT a pair of structural isomers?

Options

• \[\ce{CH3CH2CH2CH3}\] and \[\ce{CH3CH(CH3)CH3}\]

• \[\ce{CH3CH2CH=CH2}\] and \[\ce{CH3CH=CHCH3}\]

• \[\ce{CH3CH2CH2OH}\] and \[\ce{CH3CH2OCH3}\]

• \[\ce{CH3CH2OCH3}\] and \[\ce{CH3CH2CHO}\]

Answer 1

\[\ce{CH3CH2OCH3}\] and \[\ce{CH3CH2CHO}\]

Explanation:

Isomers have the same molecular formula but different structural formulae. The molecular formula of CH₃CH₂OCH₃ is C₃H₈O and the molecular formula of CH₃CH₂CHO is C₃H₆O. Thus, CH₃CH₂OCH₃ and CH₃CH₂CHO are not isomers.