ORGANIC CHEM - ALKENES

Question 1

What is the general formula of an alkene?

Answer 1

CnH2n

Question 2

What is the functional group of an alkene?

Answer 2

C=C

Question 3

Electrophilic addition with Br2:
- reagent?
- conditions?
- what happens?

Answer 3

• reagent: Br2
• conditions: aq (bromine water)
• what happens: C=C opens up and Br and Br added onto the 2 C atoms of the double bond

Question 4

Electrophilic addition with HBr:
- reagent?
- conditions?
- what happens?

Answer 4

• reagent: HBr
• conditions: none
• what happens: C=C opens up and H and Br added onto the 2 C atoms of the double bond

Question 5

Electrophilic addition with H2SO4:
- reagent?
- conditions?
- what happens?

Answer 5

• reagent: H2SO4
• conditions: concentrated H2SO4, cold (typically room temp)
• what happens: C=C opens up and H and OSO2OH added onto the 2 C atoms of the double bond

Question 6

Electrophilic addition with H2O:
- reagent?
- conditions?
- what happens?

Answer 6

• reagent: H2O (with strong acid (eg: H2SO4/H3PO4))
• conditions: none
• what happens: C=C opens up and H and OH added onto the 2 C atoms of the double bond