Chemistry Fundamental Principles of Organic Chemistry UHS 2024
PMDC Verified Question 1 of 83
1-Butene and 2-Butene are showing which type of isomerism?
A
Functional Group
B
Metamerism
C
Position
D
Chain
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Position
Concept:

When two isomers have the identical carbon skeleton (parent chain) and the same functional group, but the location of the functional group differs, they are position isomers.

Solution:

  • Both molecules have a 4-carbon continuous chain (butene).


  • In 1-butene, the double bond starts at carbon-1.


  • In 2-butene, the double bond is shifted and starts at carbon-2.


  • Because only the position of the double bond has changed, this is position isomerism.


Why other options are incorrect:

The functional group (alkene) is exactly the same, ruling out functional isomerism. The parent chain length (4 carbons) is identical, ruling out chain isomerism.

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