Alkenes

Question 1

Are Alkenes Saturated or unsaturated

Answer 1

UNsaturated

Question 2

How do Alkenes bond (description)

Answer 2

SP2 hybridisation = sigma bond, and left over p orbitals form a pi-bond,

Question 3

Functional Group of Alkenes

Answer 3

C=C

Question 4

what is an E isomer

Answer 4

large groups on opposite sides

Question 5

Name all electrophilic addition reactions for alkenes

Answer 5

Hydrogenation
Hydration
Halogenation

Question 6

Explain Hydrogenation of alkene in detail

Answer 6

Alkene + Hydrogen –> Alkane
the pi bond breaks and Hs joins
Needs Ni catalyst

Question 7

Explain Hydration of alkene in detail

Answer 7

Alkene + Steam —> Alcohol
Phosphoric acid catalyst

Question 8

Explain Halogenation of alkene in detail

Answer 8

Alkene + HX or X2 —> haloalkane or dihaloalkane
pi-bond breaks and halogen(s) (and/or H) joins on

Question 9

Explain Addition polymerisation of an alkene

Answer 9

monomers are around the C=C,
C=C breaks and connects to other monomers

Question 10

First alkene

Answer 10

LOL trick question not one

Question 11

Second Alkene

Answer 11

Ethene

Question 12

Propene + Cl2. —->

Answer 12

1,2 di chloro propane

Question 13

During hetrolytic fission what happens

Answer 13

both electrons go to the atom with the delta negitive

Question 14

Explain Homolytic fission

Answer 14

One elctron goes to each,
Free radical forms

Question 15

which is stronger pi or sigma bond

Answer 15

sigma bond, pi bond breaks first

Question 16

what reaction types do alkenes do

Answer 16

• Electrophilic addition
  -Addition Polymerisation

Question 17

what is a Z isomer

Answer 17

BIG group on same side

Question 18

why can alkenes create isomers

Answer 18

C=C can’t rotate

Question 19

catalyst needed when alkene forms alcohol

Answer 19

acid catalyst (such as phosophoric)

Question 20

Conditions needed for when alkene forms alkane

Answer 20

Ni catalyst
high pressure and temp

Question 21

conditions needed for alkene –> alcohol

Answer 21

acid catalyist (phosphoric)
high temp and pressure

Question 22

according to makinokovs rule which is major product

Answer 22

one where the halogen is on the C with most alkyl groups (attached to Cs not H)

Question 23

General formula of Alkenes

Answer 23

CnH2n

Question 24

shape and angle of C=C

Answer 24

120 and trigonal planr

Question 25

are alkenes more or less reactive than alkanes

Answer 25

more as the high e- density of pi-bond and its easier to break than a sigma