Alkene

Question 1

C-C bond

Answer 1

Sigma bond

Question 2

C=C bond

Answer 2

Pi and sigma

Question 3

Why is there no rotation around a c=c bond ?

Answer 3

The pi bond formed by overlap of p orbitals
C=c are made from pi and sigma bond
If there was any rotation p orbitals would no longer overlap and the pi bond would break

Question 4

Electrophile

Answer 4

Electron pair acceptor

Question 5

Nucleophile

Answer 5

Electron pair donor

Question 6

3 types of electrophiles

Answer 6

Halogen hallides eg Hbr
Halogens eg Br2
Sulphuric acid ( H2SO4)

Question 7

How to tell if molecule is major or minor

Answer 7

Molecule made from tertiary carbocation which is more stable than secondary/ primary carbocation due to greater positive inductive effect as greater alkyl groups

Question 8

Explain why bromine molecules react with the double bond in Alkenes

Answer 8

Bromine is a non polar molecule
The c=c has a high electron density/ is electron rich
This indices a dipole in bromine
The delta + is attracted to c=c double bond

Question 9

Stereoisomers

Answer 9

Same structure formula but different arrangement of atoms in space
No rotation around c=c bond
Each carbon of the bond has two different group

Question 10

E stereoisomers

Answer 10

Priority groups attach a different sides of carbon

Question 11

Z. Stereoisomers.

Answer 11

Prior to group attached to same carbon on both sides