Carbon-carbon single bonds can rotate while carbon-carbon double bonds cannot rotate. How many different structures are shown below.

Name: Carbon-carbon single bonds can rotate while carbon-carbon double bonds cannot rotate. How many different structures are shown below.
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Question

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There are three different structures shown in the image, each with a different arrangement of the carbon-carbon single bonds. The double bond cannot rotate, so it does not contribute to the number of unique structures.

Carbon-Carbon Single Bonds Can Rotate While Carbon-Carbon Double Bonds Cannot