Alkenes

Question 1

With hydrogen

Answer 1

Type of reaction: free radical addition/reduction/hydrogenation
Condition: catalyst nickel at 150°C
Change in functional group: alkene –> alkane
Electrophile: Hδ+

Question 1

With halogen

Answer 1

Type of reaction: electrophilic addition
Condition: mix/shake at room temperature
Change in functional group: alkene –> dihalogenoalkane
Electrophile: Xδ+

Question 2

With hydrogen halide

Answer 2

Type of reaction: electrophilic addition
Condition: mix/shake at room temperature
Change in functional group: alkene –> halogenoalkane
Electrophile: Hδ+

Question 3

With steam

Answer 3

Type of reaction: electrophilic addition/hydration
Condition: concentrated phosphoric acid
Change in functional group: alkene –> alcohol
Electrophile: H+ from the acid

Question 4

With acidified potassium manganate solution

Answer 4

Type of reaction: oxidation
Condition: mix/shake at room temperature
Change in functional group: alkene –> diol
Observation: purple –> colourless

Question 5

With bromine water

Answer 5

Type of reaction: electrophilic addition
Condition: mix/shake at room temperature
Change in functional group: alkene –> bromoalcohol
Observation: orange –> colourless