Alkenes

Question 1

Two types of bonds formed by the overlapping of orbitals in ethene

Answer 1

Sigma bonds (σ)
Pi bonds (π)

Question 2

Sigma bonds (σ) in ethene

Answer 2

Each carbon atom uses three of its four electrons to form Sigma bonds
Two between the hydrogen and carbon
One between the double bonded carbon

Question 3

Pi bonds (π) in ethene

Answer 3

The fourth electron from each carbon atom occupies a p orbital which overlaps sideways with another p-orbital to form a pi bond

Question 4

This means that the C-C double bond is

Answer 4

One pi bond and one sigma bond

Question 5

Bond angles around carbon atom

Answer 5

120 degrees ( 3 bonding pairs )

Question 6

Why cant ethene or other alkenes rotate

Answer 6

Pi bonds cant rotate because any rotation would reduce the overlap of the p orbitals

Question 7

Effect of alkenes not being able to rotate

Answer 7

The structure of alkenes across the double bond is effectively locked