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Alkenes

Total questions: 60

Worksheet time: 37mins

Name
Class
Date
1.

Which of the following is a general formula of alkenes?

a)

CnH2n+2

b)

CnH2

c)

CnH2n-2

d)

CnH2n-1

2.

Which of the following shows the structure of ethene?

a)
b)
c)
d)
3.

A compound consists of carbon and hydrogen elements only. It also contains a carbon-carbon double bond. This compound is known as

a)

saturated organic compound

b)

unsaturated organic compound

c)

saturated hydrocarbon

d)

unsaturated hydrocarbon

4.

Ethane reacts with bromine under suitable condition.

Which of the following is a product of this reaction?

a)

bromomethane

b)

dibromoemethane

c)

bromoethane

d)

tribromopropane

5.

Which of the following is not a chemical properties of alkenes?

a)

combustion

b)

substitution

c)

addition reaction

d)

polymerisation

6.

Ethene reacts with acidified potassium manganate (VII) solution to form a product.

What is the name of this reaction ?

a)

halogenation

b)

hydrogenation

c)

hydration

d)

oxidation

7.

What is the condition for hydration of butene ?

a)

phosphoric acid, 60 atm, 300 0C

b)

Nickel or platinum, 180 oC

c)

1000atm, 200 oC

d)

room temperature

8.

Ethene reacts with acidified potassium manganate (VII) solution for form W.

What is W?

a)

ethanol

b)

ethane

c)

ethan-1,2-diol

d)

ethane-1,2-diol

9.
What is the general formula of the alkynes?
a)
CnH2n+1
b)
CnH2n+2
c)
CnH2n-1
d)
CnH2n-2
10.
Which of the following could contain a triple bond?
a)
C4H10
b)
C4H8
c)
C4H6
d)
C4H12
11.

What is the structure of 2-methyl pent-2-ene ?

a)

a

b)

b

c)

c

d)

d

12.
How many carbons are in the backbone (longest chain) of this organic compound: 2,3,3-triethyl-4-nonene
a)
2
b)
6
c)
7
d)
9
13.
How many carbons are in the longest chain of the following molecule:
a)
11
b)
10
c)
9
d)
8
14.

Which reagent is needed to change CH3CH=CH2 to CH3CHClCH3

a)

Cl2 (aq)

b)

SOCl2

c)

PCl3

d)

HCl

15.

Which of the following would be named cycloheptane?

a)
b)
c)
d)
16.

Is the last step in naming alkenes and alkyne.

a)

Writing the name of the main chain.

b)

Writing the location of the double/triple bond and the name of the main chain.

c)

Writing the location of the branches and the name of the main chain.

17.

Is the name of the representation showed in the image.

a)

Line Diagram/Skeletal Formula

b)

Condensed Formula

c)

Structural Formula

d)

Molecular Formula

18.
The first member of the alkene series is methene.
a)
True
b)
False
19.

Possible products of INCOMPLETE combustion

a)

Carbon (C)

b)

Carbon Monoxide (CO)

c)

Carbon Dioxide (CO2)

d)

Water (H2O)

20.

If an alkene has 20 carbon atoms, how many hydrogen atoms will it have?

a)

20

b)

22

c)

40

d)

42

21.

When HBr reacts with propene, what is the name of the major product?

a)

1-bromopropene

b)

2-bromopropene

c)

1-bromopropane

d)

2-bromopropane

22.

But-1-ene reacts with steam in the presence of a concentrated acid catalyst. What is the major product formed?

a)

Butan-1-ol

b)

Butan-2-ol

c)

Butanone

d)

Butanal

23.

Each member of a homologous series differs from the next by molecular mass of

a)

12

b)

14

c)

16

d)

44

24.

Which of the following can be used to distinguish between alkanes and alkenes?

a)

add a few drops of aqueous bromine

b)

add a few drops of Universal indicator

c)

add a piece of blue litmus paper

d)

add a piece of red litmus paper

25.

Which of the following statement is correct?

a)

Alkenes can turn aqueous bromine from reddish-brown to colourless.

b)

Alkenes can turn aqueous bromine from colourless to reddish-brown.

c)

Alkanes can turn aqueous bromine from reddish-brown to colourless.

d)

Alkanes can turn aqueous bromine from colourless to reddish-brown.

26.

Which are the following are all alkenes?

a)

methane, ethane, propane

b)

methane, ethene, propene

c)

methene, ethene, propene

d)

ethene, propene, butene

27.

If H2 is added to C4H8, the product will be C4H12

a)

True

b)

False

28.

Which of the following statements concerning propene is/are correct?

(1) It dissolves in water to form propan-1-ol.

(2) It can undergo addition polymerization.

(3) It can be prepared by the catalytic cracking of a saturated hydrocarbon.

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

29.

Which of the following products may be formed from the cracking of heavy oil fraction?

(1) CO

(2) C2H4

(3) C8H18

a)

(1) and (2) only

b)

(1) and (3) only

c)

(2) and (3) only

d)

(1), (2) and (3)

30.

Propene reacts with acidified potassium permanganate solution to form

a)

CH3CH2CH2OH.

b)

CH3CH(OH)CH3.

c)

CH3CH(OH)CH2OH.

d)

CH2OHCH(OH)CH2OH.

31.

C10H22 -----> C6H14 + 2 X

Which of the following concerning the above process and X is correct?

a)

fractional distillation and an alkane

b)

fractional distillation and an alkene

c)

cracking and an alkane

d)

cracking and an alkene

32.

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

33.

Which of the following statements concerning the compounds C2H4, C3H6 and C4H10 is correct?

a)

They belong to the same homologous series.

b)

They are unsaturated hydrocarbons.

c)

They are gases at room temperature and pressure.

d)

They have the same physical properties.

34.

A compound has the structure as shown:


Which of the following statements about this compound are correct?

(1) It can decolorize bromine water.

(2) It can be polymerized.

(3) It can burn in air.

a)

(1) & (2) only

b)

(1) & (3) only

c)

(2) & (3) only

d)

(1), (2) & (3)

35.

When testing for alkenes (unsaturation) bromine water turns from...

a)

orange --> blue/black

b)

colourless --> pink

c)

orange --> colourless

d)

orange --> clear

36.
Which of the following will react with Br2(l)
a)
hexene 
b)
cyclohexane
c)
hexane
d)
alkanes
37.
this is
a)
alkyne
b)
aromatic hydrocarbon
c)
alkene
38.
alkene is:
a)
hydrocarbon with a double bond
b)
hydrocarbon with a triple bond
c)
a hydrocarbon with one or more benzene rings
d)
organic compound with single bonds
39.
alkyne is:
a)
hydrocarbon with a triple bond
b)
a hydrocarbon with one or more benzene rings
c)
hydrocarbon with a double bond
d)
organic compound with single bonds
40.

What is the correct structure for 2 - butene?

a)
b)
c)
d)
41.

The functional group in an alkene is...

(a)  

42.

When testing to alkanes the positive test is...

a)

stays orange

b)

orange --> clear

c)

orange --> colourless

d)

stays colourless

43.

Which of the following reagents and condition is suitable to be used to prepare propan-1,2-diol from propene.

a)

Acidified potassium manganate(VII) at room temperature

b)

Acidified potassium dichromate in the presence of heat.

c)

Hydrogen gas in the presence of heat and pressure.

d)

Water in the presence of concentrated sulphuric acid.

44.

When but-1-ene was heated with acidified potassium manganate(VII), two compounds were formed. Identify the correct compounds.

a)

Propanoic acid and carbon dioxide

b)

Propanal and methane

c)

Butanal and water

d)

Propan-2-one and ethanal

45.

Which of the following compounds is organic?

a)

CaCO3

b)

CO2

c)

CH4

d)

H2CO3

46.

Which is the correct structure for the name: 5,6,6-trimethylhept-2-ene ?

a)
b)
c)
d)
47.

What are the first 3 alkenes in increasing carbon chain length?

a)

Methene, ethene, propene

b)

Ethene, propene, pentene

c)

Ethene, propene, butene

d)

Butene, ethene, propene

e)

Methene, ethene, propane

48.

What conditions are necessary in the reaction of alkenes with hydrogen?

a)

300°C, Iron catalyst

b)

60°C, Nickel catalyst

c)

600°C, High pressure

d)

Low temperature, Nickel catalyst

e)

600°C, High temperature

49.

Check the reactions which are undergone by alkenes.

a)

oxidation

b)

addition

c)

substitution

d)

polymerization

e)

neutralization

50.

Alkenes reacted with hydrogen in the presence of ......... catalysts:

a)

Ni

b)

Pd

c)

Pt

d)

Pb

51.

In alkenes as number of C atoms (a)   , m.p., b.p. and density also increases

52.
What are the conditions required to convert alkenes to alcohols?
a)
360°C, 1 atm, H2SO4(aq) catalyst
b)
300atm, 60°C, H3PO4(aq) catalyst
c)
60atm, 300°C, H3PO4(aq) catalyst
d)
3o0°C, 60 atm, H2SO4(aq) catalyst
53.
What are the conditions required for the addition of bromine to alkene?
a)
No special conditions. It is a spontaneous reaction
b)
in presence of UV light
c)
200°C, Nickel Catalyst
d)
high temperature & pressure
54.
What are conditions necessary for the conversion of propene to propane by adding hydrogen?
a)
250°C, Manganese catalyst
b)
300°C, Nickel Catalyst
c)
200°C, Niobium Catalyst
d)
200°C, Nickel Catalyst
55.
The reaction of ethene with steam is an example of an addition reaction.
a)
True
b)
False
56.
Alkenes are:
a)
saturated, because they do not have the maximum number of hydrogen atoms
b)
unsaturated, because they do not have the maximum number of hydrogen atoms
c)
unsaturated, because they have the maximum number of hydrogen atoms
d)
aromatic compounds
57.

Which of the following is not an addition reaction?

a)

CH2Cl2 + Cl2 → CHCl3 + HCl

b)

C2H4 + Br2 → C2H4Br2

c)

nC2H4 → -(-CH2 – CH2 -)-n

d)

C3H6 + H2O → C3H7OH

58.

Which substances will decolourise aqueous bromine?

a)

1 and 2

b)

2 and 3

c)

2 and 4

d)

1 and 4

59.

Which of the following are NOT the physical properties of Alkenes?

a)

Cannot conduct electricity

b)

Low density

c)

Soluble in water

d)

Neutral compounds

60.

Alkenes burn with more …… flame compared with alkanes of the same number of carbon atoms because the percentage of carbon by mass in alkenes is ……

a)

blue, higher

b)

sooty, higher

c)

sooty, lower

d)

blue, lower

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