Bootcamp GC question

[helloboys]

How would the bond energy and bond length of a carbon-carbon bond in C2H6 compare to C2H4?

Answer: The bond energy for C2H4 would be greater, but the bond length would be shorter.

I understand that bond length would be shorter because single vs double bond. But wouldn't the bond energy for C2H4 be less than C2H6 because C2H4 has a double bound, and therefore more stable, which means it will have less energy?

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[DMikes]

Bond energy ~ Bond strength

 

[themuffinman11]

A C=C bond has a smaller bond length, meaning it will take more energy to break that carbon-carbon double bond. I think you are getting bond energy mixed up with like the energy that a molecule exists in because in that case we think of a more stable molecule existing at a lower energy state (ex. cyclohexane conformations or newman projections)

 

[Chubz0924]

the shorter the bond the stronger it is. The longer the bond, the weaker it is.