Some of the compounds belong to the homologous series called the alkanes. Which hydrocarbons are alkanes? Select three compounds from A, B, C, D, and E.

Which homologous series do the compounds which are not alkanes belong to? Select one option:

• Alcohols
• Alkenes
• Carboxylic acids
• Esters

Compound A, $C_2{H}_6$, burns completely in oxygen. State the names of the two products of this reaction.

Complete the sentences about fractional distillation. Use words from the list below: [colder, condense, cracked, evaporate, fractions, heated, hotter, polymers]

• Crude oil is _____________ to vaporise it before it enters the fractionating column.
• The fractionating column is _____________ at the bottom than at the top.
• Hydrocarbon vapours rise up the column and _____________ at different heights.
• The separated groups of hydrocarbons are called _____________.

Fossil fuels like crude oil are classified as finite resources. Explain what is meant by a finite resource.