4.7.2.1 Structure and formulae of alkenes

Question 1

What are alkenes?

Answer 1

• Hydrocarbons with a double carbon-carbon bond

Question 2

What is the general formula for the homologous series of alkenes?

Answer 2

• CnH2n

Question 3

Why are alkene molecules unsaturated?

Answer 3

• Because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms

Question 4

What are the first four members of the homologous series of alkenes?

Answer 4

• Methene
• Ethene
• Propane
• Butene

Question 5

What forms can alkene molecules be represented as?

Answer 5

• C3H6
  or

    H   H    H H - C - C = C
    H         H