Question 1

Which of the following is an alkane?

Accepted Answer

Cyclohexane

Answer

Hexene

Answer

Propene

Answer

Ethanol

Question 2

Looking at the chemical formulae of these compounds, which is an alkane?

Accepted Answer

C3H8

Answer

C3H6

Answer

C5H10

Answer

C2H4

Question 3

What is the name of the alkane which has the formula C4H10?

Accepted Answer

Butane

Answer

Octane

Answer

Ethane

Answer

Butene

Question 4

Alkanes are saturated hydrocarbons. What does this mean?

Accepted Answer

All carbon atoms are bonded by single covalent bonds

Answer

They are very reactive

Answer

There are some C=C double bonds present in the molecule

Answer

There are some carbon-carbon triple bonds present in the molecule

Question 5

When hydrocarbons like the alkanes burn in plenty of air, what type of reaction takes place?

Accepted Answer

Complete combustion

Answer

Thermal decomposition

Answer

Displacement reaction

Answer

Incomplete combustion

Question 6

Which is a correct statement about incomplete combustion?

Accepted Answer

Poisonous carbon monoxide may be produced.

Answer

It releases more energy than complete combustion

Answer

It is cleaner than complete combustion

Question 7

What is needed in order for chlorine to react with ethane in a substitution reaction?

Accepted Answer

Ultraviolet light

Answer

Enzyme

Answer

High temperature

Answer

Catalyst

Question 8

Which of the following is an alkene?

Accepted Answer

Hexene

Answer

Pentane

Answer

Hexane

Answer

Decane

Question 9

Why are alkenes more reactive than alkanes?

Accepted Answer

The double bond can break open easily

Answer

The bonds between the atoms are weaker in alkenes

Answer

They are always smaller molecules

Question 10

How do you test for an alkene?

Accepted Answer

They turn bromine water from reddish brown to colourless.

Answer

They turn limewater cloudy.

Answer

They turn bromine water from colourless to reddish-brown.

Answer

They turn universal indicator purple.

Question 11

What is the general formula for an alkane?

Accepted Answer

CnH2n+2

Answer

CnH2n-2

Answer

CnH2n

Answer

CnH3n

Question 12

The diagrams show the structure of five hydrocarbons. Which three hydrocarbons are isomers of each other?

Accepted Answer

1, 2 and 4

Answer

2,  3 and 4

Answer

2, 3 and 5

Answer

3, 4 and 5

Question 13

One mole of each alkane undergoes complete combustion. Which alkane will produce seven moles of products?

Accepted Answer

C3H8

Answer

C4H10

Answer

CH4

Answer

C2H6

Question 14

With which substance will ethene react to form more than one product?

Accepted Answer

oxygen

Answer

argon

Answer

hydrogen

Answer

steam

Question 15

Which statement about isomers of a compound is always correct?

Accepted Answer

They have the same molecular formula.

Answer

They have different relative molecular masses.

Answer

They have only carbon and hydrogen in their molecules.

Answer

They have different empirical formulae.

Question 16

How many of the structures show an unsaturated hydrocarbon molecules?

Accepted Answer

1

Answer

2

Answer

4

Answer

3

Question 17

Which diagram shows the isomer of butane?

Accepted Answer

D

Answer

B

Answer

A

Answer

C

Question 18

The structures of three hydrocarbons from the same homologous series are shown. Which statement is correct?

Accepted Answer

W has the lowest boiling point.

Answer

All three molecules are unsaturated hydrocarbons.

Answer

X is an isomer of Y.

Answer

All three molecules have the same empirical formula.

Question 19

Which statement about alkanes is correct?

Accepted Answer

Alkanes react with chlorine by substitution.

Answer

Alkanes react with bromine by addition.

Answer

Alkanes react with steam by addition.

Answer

Butane has three more carbon atoms and eight more hydrogen atoms than methane.

Question 20

Which statement about the properties of the four alkanes from methane to butane is not correct?

Accepted Answer

They share the same empirical formula.

Answer

Successive members of the series differ in formula by CH2.

Answer

They increase in boiling point.

Answer

They increase in viscosity.

Question 21

When butene reacts with bromine, which compound could be made?

Accepted Answer

B

Answer

C

Answer

D

Answer

A

Question 22

Methane is the first member of the alkane series of hydrocarbons. The second member is ethane. Which statements about ethane are correct?

Accepted Answer

C.  2 and 4

Answer

A.  1, 2 and 3

Answer

B.  1 and 4

Answer

D.   3 only

Question 23

Name this alkane.

Accepted Answer

butane

Answer

hexene

Answer

hexane

Answer

butene

Question 24

What is the name of this alkane?

Accepted Answer

decane

Answer

nonane

Answer

nonene

Answer

decene

Question 25

What is the name of this structure?

Accepted Answer

hex-2-ene

Answer

hept-2-ene

Answer

but-2-ene

Answer

oct-2-ene

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