4.1.3 Alkene reactions

Question 1

Name 4 reactions alkenes can go through

Answer 1

hydrogenation
halgenation
addition of hydrogen halides
hydration

Question 2

what test can you do to test for an alkene

Answer 2

Alkene + bromine water

if colourless-> C=C present
stays orange/brown -> C=C not present

as bromine water is orange/brown

Question 3

why are alkenes more reactive then alkanes

Answer 3

due to pi bond

this causes e- density above and below the sigma bond so it can break easily and form additional reactions

Question 4

what is hydrogenation

explain via using propene and what conditions are needed (2)were e

Answer 4

makes alkenes -> alkanes

propene + H2 -> propane

passes over nickel catalyst
423K

Question 5

what happens at halogenation explain using propene and the condition needed (1)

Answer 5

alkene + halogen -> haloalkane

Propene + cl2/ br2/ I2 -> yah you know what just draw it out

room temp

Question 6

what happend when a hydrogen halide is added to an alkene and what is the 2 conditions also use propene + HCl to show it

Answer 6

alkene + hydrogen halide -> haloalkane

room temp
if gas just mix but if liquid then need to bubble HCL through

Propene + HCl -> just draw

Question 7

what is formed in hydration

conditions needed

Answer 7

alchol is formed as u use H2O so it breaks up into H and OH and attaches to the alkene

the h2o needs to be as a gas so steam
and needed phosphoric acid catalyst ( H2PO4)