U3S3 alkenes

Question 1

General formula of an alkene

Answer 1

• CnH2n

Question 2

Why are alkenes unsaturated

Answer 2

• they have a C=C double bond
• they can make more bonds with extra atoms

Question 3

Why are alkenes reactive

Answer 3

• the double bond has a high electron density

Question 4

What is an electrophile

Answer 4

• electron-pair acceptors
• attracted to areas of high electron density eg. C=C double bond

Question 5

What is the test for saturation

Answer 5

• add orange bromine water
• shake
• if unsaturated, bromine is added across the double bond to form a colourless solution