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Organic chemistry

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Question 56

Crude oil is a complex mixture of hydrocarbons.

Fractional distillation of crude oil and catalytic cracking of long-chain hydrocarbons are critical processes in petroleum refining.

a.

Which physical property is the primary basis for separating the different fractions of crude oil in a fractionating column?

  • A boiling point
  • B chemical reactivity
  • C density
  • D solubility
[1]
b.

The main fractions obtained from crude oil include:

  • bitumen
  • diesel
  • fuel oil
  • gasoline
  • kerosene
  • refinery gases

Give one major use for gasoline.

[1]
c.

Give one major use for bitumen.

[1]
d.

State which of the fractions listed above has the lowest boiling point.

[1]
e.

Catalytic cracking is used to break down long-chain alkanes into more valuable shorter-chain alkanes and alkenes.

Name the catalyst used in industrial cracking.

[1]
f.

State the approximate temperature range used in industrial cracking.

[1]
g.

Dodecane (C12H26\text{C}_{12}\text{H}_{26}C12​H26​) can be cracked to produce propene (C3H6\text{C}_3\text{H}_6C3​H6​) and only one other hydrocarbon.

Write a balanced chemical equation for this reaction.

[1]
h.

Draw the displayed formula of propene (C3H6\text{C}_3\text{H}_6C3​H6​).

[1]
i.

Name the polymer formed from propene.

[1]
j.

Explain why this polymer is difficult to dispose of by landfill.

[2]
Markscheme

Organic chemistry Questions

  1. IGCSE
  2. /Chemistry
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