1.1. Separate: Chemistry and Extended Only

A hydrocarbon has the following structural formula.

i) State the molecular formula and the empirical formula of this hydrocarbon.

 molecular formula ........................................................

 empirical formula ........................................................

 [2]

 ii) Draw the structural formula of an isomer of the above hydrocarbon.

 [1]

 iii) Explain why these two hydrocarbons are isomers.

 [2]

 iv) Are these two hydrocarbons members of the same homologous series? Give a reason for your choice.

 [1]

1.2. Alkenes can be made from alkanes by cracking.

 i) Explain the term cracking.

 [2]

 ii) One mole of an alkane, when cracked, produced one mole of hexane, C₆H₁₄, and two moles of ethene.

 What is the molecular formula of the original alkane?

 [1]

1.3. Extended Only

Alkenes are used in polymerisation reactions and addition reactions.

 i) Draw the structural formula of the product formed by the addition polymerisation of but-2-ene. Its formula is given below.

[3]

 ii) Give the name and structural formula of the addition product formed from ethene and bromine.

 name ..............................................................

 structural formula ..............................................................

 [2]