Organic chemistry

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Question 41
Medium

This question is about some of the hydrocarbons found in crude oil.

The table below shows information about four hydrocarbons found in crude oil.

HydrocarbonMolecular formulaBoiling point (∘C^\circ\text{C}∘C)
MethaneCH4\text{C}\text{H}_4CH4​−162-162−162
PentaneC5H12\text{C}_5\text{H}_{12}C5​H12​363636
NonaneC9H20\text{C}_9\text{H}_{20}C9​H20​
TridecaneC13H28\text{C}_{13}\text{H}_{28}C13​H28​235235235
a.

Pentane is a hydrocarbon. What is meant by a hydrocarbon?

[2]
b.

Look at the displayed formula for pentane: Displayed chemical structure of pentane

Pentane is a saturated compound. What is meant by a saturated compound?

[1]
c.

Use the information in the table to predict the boiling point of nonane.

[1]
d.

Explain why a mixture of pentane, nonane, and tridecane can be separated by fractional distillation. In your answer, use information from the table and ideas about intermolecular forces.

[3]
e.

Nonane is one of the hydrocarbons found in diesel fuel. Nonane burns completely in a plentiful supply of oxygen. Complete the balanced symbol equation by putting numbers on the lines: C9H20+…O2→…CO2+…H2O\text{C}_{9}\text{H}_{20} + \dots \text{O}_2 \rightarrow \dots \text{CO}_2 + \dots \text{H}_2\text{O}C9​H20​+…O2​→…CO2​+…H2​O

[2]
f.

Incomplete combustion of nonane makes carbon monoxide instead of carbon dioxide. Describe and explain one problem caused by carbon monoxide.

[2]

Organic chemistry Questions

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