Which compound with C₄H₈ has a degree of unsaturation of 1 and can be separated from its chain isomer by simple distilla

Practice question

Question

Which compound with C₄H₈ has a degree of unsaturation of 1 and can be separated from its chain isomer by simple distillation?

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CH₃CH=CHCH₃ CH₂=CHCH₂CH₃ Correct CH₃CH₂C≡CH CH₃C(CH₃)=CH₂

Explanation

CH₂=CHCH₂CH₃ (but-1-ene) has one double bond (degree = 1). Its chain isomer, 2-methylpropene (CH₃C(CH₃)=CH₂), has a similar boiling point, but cyclic isomers like cyclobutane can be separated by simple distillation due to a larger boiling point difference.

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