Test Ur Organic!

Which row identifies the structure and name of the compound ?

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Which statement about members of an homologous series is correct?

• Alkanes are an homologous series with a general formula of C_nH_2n+2.

• Each member of the series has different chemical properties

• Each member of the series has a different functional group.

• Each member of the series differs from the next by a CH₃ group

Petroleum is separated into fractions by fractional distillation. Which statements are correct?

1. Petroleum is vaporised before it enters the fractionating tower.

2. Fractions with low boiling points are used as fuels.

3. Fractions with high boiling points condense at the top of the fractionating tower.

4. The fractionating tower is cool at the bottom and hot at the top.

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

What is the main constituent of natural gas?

• ethene

• methane

• nitrogen

• oxygen

Ethanol is made by reacting ethene with steam.

Ethanol is also made by the fermentation of sugar obtained from plants.

Which statement is correct?

• Fermentation is a faster process than reacting ethene and steam.

• Fermentation produces ethanol from a renewable source.

• Reacting ethene with steam produces impure ethanol.

• Reacting ethene with steam uses very little energy.

The equation shows the cracking of a hydrocarbon.

What is X?

• C₉H₂₀

• C₇H₂₀

• C₇H₁₆

• C₂H₄

Which statement about the members of any homologous series is correct?

• They have the general formula C_nH_2n+2.

• They have similar chemical reactions.

• They have the same molecular formula.

• They have the same physical state.

Which formula represents an unsaturated hydrocarbon?

• C₂H₆

• C₃H₆

• C₃H₈

• C₄H₁₀

The fractional distillation of petroleum is shown.

The gases have small molecules, the lowest boiling temperature and burn most easily. Bitumen has large molecules, has the highest boiling temperature and burns least easily.

Which statement is correct?

• All of the molecules in any one fraction are the same

• Gasoline molecules are larger than diesel oil molecules

• The oils fraction burns less well than kerosene.

• The oils fraction has a lower boiling temperature than kerosene

The structure of a hydrocarbon is shown.

The hydrocarbon is tested with bromine water.

Which row describes the type of hydrocarbon and the result of the test with bromine water?

• SATURATED - bromine water becomes colourless

• SATURATED - bromine water remains orange

• UNSATURATED - bromine water becomes colourless

• UNSATURATED - bromine water remains orange