Alkenes

Question 1

Are alkenes saturated or unsaturated

Answer 1

Unsaturated

Question 2

What is the alkene functional group

Answer 2

C=C

Question 3

How is a Pi bond formed

Answer 3

Sideways overlap of two P-orbitals

Question 4

How is a Sigma bond formed

Answer 4

Head on overlap of orbitals

Question 5

Why are alkenes reactive

Answer 5

• The Pi bond has a smaller bond enthalpy and is broken easier
• The Pi bond attracts electrophiles (as it is an electron dense region)

Question 6

Define stereoisomerism

Answer 6

Same molecular and structural formula, different arrangement of atoms in space

Question 7

Why can E/Z isomers form in alkanes

Answer 7

The C=C bond restricts rotation

Question 8

What must a compound have to have E/Z isomers

Answer 8

• A C=C bond
• Two different groups attached to each carbon atom on the C=C bond

Question 9

E isomer

Answer 9

Priority groups on opposite sides of the C=C bond

Question 10

Z isomer

Answer 10

Priority groups on same side of the C=C bond

Question 11

In electrophilic addition
which C will the HALIDE bond to in order to form the MAJOR product

Answer 11

The carbon bonded to the most other carbon atoms

Question 12

Alkene to alkane

Answer 12

Hydrogenation - H2/Ni catalyst

Question 13

Alkene to haloalkane

Answer 13

Electrophilic addition - X2 or HX

Question 14

Alkene to alcohol

Answer 14

Dilute H3PO4