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ALKANES

Total questions: 45

Worksheet time: 37mins

Name
Class
Date
1.
What is the general formula for saturated hydrocarbons?
a)
CnH2n
b)
CnHn+1
c)
CnH2n+1
d)
CnH2n+2
2.

Which of the following statements concerning the reaction of methane with bromine is/are correct?

(1) It is an addition reaction.

(2) It is a substitution reaction.

(3) A similar reaction will occur if propane is used instead of methane.

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

3.

Which is the structures with IUPAC nomenclature


2,2,4-trimethylpentane

a)
b)
c)
d)
4.

What happens if an alkane reacts with limited oxygen?

a)

Produced carbon dioxide and water

b)

Produced carbon monoxide and water

c)

Produced oxygen and water

d)

Produced soot and water

5.

What is the condition needed for substitution reaction with chlorine?

a)

presence of sunlight

b)

presence of red light

c)

presence of UV light

d)

all of the above

6.

Which of the following is NOT a product formed when methane reacts under the needed conditions with chlorine?

a)

CH3Cl

b)

CH2Cl2

c)

CHCl4

d)

CCl4

7.

What type of chemical reaction is this:

C3H8 + 5O2 --> 3CO2 + 4H2O

a)

Incomplete combustion

b)

Substitution with oxygen

c)

Complete combustion

d)

Substitution with chlorine

8.

What type of chemical reaction is this:

C3H8 + Br2 --> C3H7CBr + HBr

a)

Incomplete combustion

b)

Substitution with chlorine

c)

Complete combustion

d)

Substitution with bromine

9.

Which of the following is true about incomplete combustion?

a)

It takes place because there is too much supply of air

b)

It takes place because there is not enough supply of air

c)

The products are soot and hydrocarbons

d)

The products are hydrogen and water

10.

The following is a product of the reaction between propane and chlorine: C3H8Cl2

a)

TRUE

b)

FALSE

11.

The boiling points of alkane molecules increase as their molecular sizes increase.

a)

True

b)

False

12.

State the type of reaction of the above reaction.

a)

Nucleophilic Addition Reaction

b)

Electrophilic Substitution reaction

c)

Free Radical Substitution reaction

d)

Rearrangement

13.

How many steps of mechanism for Free Radical Substitution Reaction of Alkane.

a)

1

b)

2

c)

3

d)

4

14.

What is the name of step for the mechanism above.

a)

Chain Elimination Step

b)

Chain Initiation step

c)

Chain Termination step

d)

Chain Propagation step

15.

What is the major product formed for this reaction.

a)
b)
c)
d)
16.

State the function of UV light for the above reaction.

a)

To provide energy for Heterolytic Cleavage occur in Bromine molecule.

b)

To provide energy for Homolytic Cleavage occur in Bromine molecule.

c)

To provide energy for Heterolytic Cleavage occur in Propane molecule.

d)

To provide energy for Homolytic Cleavage occur in Propane molecule.

17.

What step in Free Radical Substitution Reaction Mechanism that can be repeated to form above products.

a)

Chain Propagation Step

b)

Chain Termination Step

c)

Chain Initiation Step

d)

Chain Elimination Step

18.

Which step produces two highly reactive chlorine free radicals.

a)

Chain Propagation Step

b)

Chain Termination Step

c)

Chain Initiation Step

d)

Chain Elimination Step

19.

Single barbed arrow show....

a)

attack or movement of an unpaired electron

b)

attack or movement of an electron pair

c)

attack or movemant of a lone pair

d)

attack or movemant of an electron pair and unpaired electron

20.

Draw the structural formulae of monosubstituted major formed when the above alkane subjected to the bromination reaction under sunlight.

a)
b)
c)
d)
21.

Give the name of reaction, when alkanes react with bromine in the presence of UV.

a)

Hydrogenation

b)

Halogenation

c)

Hydration

d)

Hydrohalogenation

22.

What is the name of this step?

a)

Termination Step

b)

Propagation Step

c)

Initiation Step

d)

Cleavage Step

23.

What is the type of cleavage that occurs in the initiation step when a halogen is exposed to UV light?

a)

Heterolytic fission

b)

Hoholytic fission

c)

Homoterolytic fission

d)

Homolytic fission

24.

Which equation is a propagation step in the conversion of chloromethane into dichloromethane by reaction with chlorine in the presence of ultraviolet light?

a)

CHCl3 + Cl2 ⟶ CCl4 + HCl

b)

●CH2Cl + ●Cl ⟶ CH2Cl2

c)

CH3Cl + ●Cl ⟶ CH2Cl2 + ●H

d)

●CH2Cl + Cl2 ⟶ CH2Cl2 + ●Cl

25.

Which one of the following is NOT a propagation reaction between methane and chlorine?

a)

CH4 + Cl• → CH3• + HCl

b)

CH3• + Cl• → CH3Cl + H•

c)

CH3• + Cl2 → CH3Cl + Cl•

d)

CH3Cl + Cl• → CH2Cl• + HCl

26.

Which step is this in the synthesis of chloroalkanes?

a)

Termination

b)

Initiation

c)

Propagation

d)

Position

27.

A particle with an unpaired electron:

a)

Ion

b)

Nucleophile

c)

Free Radical

d)

Neutrophile

28.

Crude oil is made up of:

a)

Ethane

b)

Butane

c)

A mixture of different hydrocarbons

d)

Extremely large hydrocarbons which are broken up once extracted

29.

Different fractions in crude oil are separated by:

a)

Cracking

b)

Fractional Distillation

c)

Filtration

d)

Crystalisation

30.

Shorter hydrocarbons have:

a)

Higher boiling points

b)

Lower boiling points

31.

Petrol is used for:

a)

Fuel in cars

b)

Fuel in aircraft

c)

Domestic heating and cooking

d)

Road surfacing

32.

Kerosene (paraffin) is used for:

a)

Fuel for cars

b)

Domestic heating and cooking

c)

Fuel in aircraft

d)

Fuel for large ships and in power stations

33.

Fuel oil is used for:

a)

Fuel in some cars and larger vehicles

b)

Fuel for large ships and in some power stations

c)

Roof and road surfacing

d)

Fuel for cars

34.

Bitumen is used for:

a)

Fuel for large ships and in some power stations

b)

Roof and road surfacing

c)

Fuel in aircraft

d)

Fuel in cars

35.
Crude oil is also called what?
a)
biomass
b)
fossils
c)
coal
d)
petroleum
36.

Where do long chain hydrocarbons collect?

a)

At the top

b)

In the middle

c)

At the bottom

37.
This colorless, odorless gas can be deadly if breathed in. It is produced by incomplete combustion (not enough oxygen).
a)
SO2
b)
CO
c)
NO
d)
NO2
38.
The general term for air pollution that reduces visibility, especially in cities. 
a)
atmospheric transport
b)
pollution 
c)
smog
d)
wet scrubber
39.

Produced by burning fossil fuels

a)

Carbon Dioxide

b)

Sulfur Dioxide

c)

Nitrogen Dioxide

d)

Phytochemical Oxidant

40.
Which of these problems can be caused by air pollution?
a)
Respiratory problems
b)
Reduced food sources for humans
c)
Increased disease for humans
d)
Decrease in global temperatures
41.
What causes acid rain?
a)
High concentrations of sulfuric or nitric acid from pollution
b)
Fertilizer use
c)
Pesticide use
d)
CFCs
42.
Increase in which gas is primarily responsible for increased global warming?
a)
Carbon dioxide
b)
Water vapor
c)
Methane
d)
Nitric oxides
43.
Combines with other pollutants to form acid rain
a)
Nitrogen oxides & sulfur dioxide
b)
Particulate matter & lead
c)
Nitrogen oxides & ground-level ozone
d)
Sulfur dioxide & ground-level ozone
44.
The principal component of smog
Source: Chemical reaction of  VOCs and NOx
Health effects: breathing problems, reduced lung capacity, asthma, eye irritation, reduced resistance to disease
Environmental effects: can damage plants
a)
Pb
b)
CO
c)
SO2
d)
O3
45.

Dust, ash and pollen are examples of this air pollutant...

a)

Lead

b)

Ground-level ozone

c)

Particulate matter

d)

Nitrogen oxides

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