Alkenes

Question 1

What do Alkenes do?

Answer 1

At least one double bond; CnH2n. More reactive than alkanes, take part in addition reactions.

Question 2

What can Alkenes form?

Answer 2

Can form E/Z isomers, including Cis-Trans isomers.

Question 3

What are C=C bonds made up from?

Answer 3

C=C bonds are made up from; a sigma bond and a pi bond. Sigma bond present in alkanes.

Question 4

What is a sigma bond?

Answer 4

A sigma bond is found directly between two C atoms by overlap of orbitals. Each carbon atoms contributes one electron to the electron pair in the sigma-bond.

Question 5

What is a Pi bond?

Answer 5

A pi-bond is formed above/below plane of carbon atoms sideways overlap of p-orbitals. Each carbon atom contributes on electron from a p-orbital to the electron pair in the pi-bond.

Question 6

What do Pi bonds do?

Answer 6

Pi-bond fixes carbon atoms in position; preventing rotation of the bond.

Question 7

What happens in Alkenes?

Answer 7

In alkenes, each carbon included in the double bond: use three of its electrons in the formation of three sigma bonds, and an electron in a pi-bond.

Question 8

What is a Pi bond?

Answer 8

A pi-bond is the reactive part of a double bond formed above and below the plane of the bonded atoms by sideways overlap of p-orbitals.