Chapter 3. Alkenes and Alkynes
Ethene, p. 105/107

Here is the simplest alkene. Measure the length of the carbon-carbon double bond. How much shorter is it than a carbon-carbon single bond?

Question:

A more subtle point comes from the length of the carbon-hydrogen bond. Why is the C—H bond in ethene shorter than the C—H bond in ethane?
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