Unit 2 Alkenes

Question 1

What is the general formula of an alkene

Answer 1

C H
n
2n

Question 2

What is the name of the reaction that alkenes undergo to become a haloalkane

Answer 2

Electrophilic addition reactions

Question 3

What is the general equation for a electrophilic addition reaction

Answer 3

CH2CH2 + X-Y —-> CH2XCH2Y

Question 4

What are the conditions for electrophilic addition

Answer 4

Room temp and excess of electrophile

Question 5

How do you test for the presence of an alkene

Answer 5

Add bromine water to the solution you are testing, if alkene is present the colour will change from orange to colourless

Question 6

What is the most stable form of carbocation

Answer 6

Tertiary carbocation is the more stable than a primary and secondary carbocation. This is due to the positive inductive effect of the alkyl groups pushing electrons on to the C+ so it is more likely to be attacked by an electrophile.