Alkenes (bonding and structure)

Question 1

What does a C–C double bond consist of?

Answer 1

A σ (sigma) bond and a 𝛑 (pi) bond
- σ bond formed by direct overlap of orbitals between bonding atoms
- 𝛑 bond = sideways overlap of adjacet p orbitals above and below the C atoms. The e- of this is concentrated above and below the carbon atoms.

Question 2

Do C–C double bonds count as one or two electron reigions?

Answer 2

One. This is important when working out the shape of alkenes. They have equal repulsion to sigma bonds