ORGANIC CHEMISTRY – REVISION QUESTIONS
G.
Question 1
al Nov 2001
H
H
H
C
C
H
H
O
H
Consider the following organic compounds when answering the
questions below:
A.
C2H2
D.
C2H5OH
B.
C2H4
E.
HCO2CH2CH3
C.
C2H6
F.
HCO2H
2.1
Give the IUPAC systematic name of E.
1.1
2.2
Choose from the list a substance that is used in the laboratory
preparation of E.
(2)
2.3
Give the NAME of the catalyst that is needed for the reaction
referred to in 2.2.
(2)
2.4
Choose from the list a substance that is formed during the
catalytic oxidation of G.
(2)
2.5
Write down the structural formula of three isomers of substance
A.
(6)
2.6
Under each of the isomers in 2.5, write down its IUPAC
(systematic) name.
Which compound has two structural isomers? (Write down only
the letter)
(2)
Write down the balanced equation for the reaction of compound C
with excess oxygen.
(3)
Which compound is the product of the fermentation of grapes?
(Letter only)
(2)
Which compound is used in welding? (Letter only)
(2)
Explain how you can experimentally distinguish between
compounds B and C,
(4)
Write down the structural formula of the organic product of the
reaction between compounds D and F.
(3)
Write down the systematic (IUPAC) name of the product in
question 1.6
(2)
Write down the NAME of the catalyst that is generally used in the
reaction between compounds D and F
(2)
[20]
1.2
1.3
1.4
1.5
1.6
1.7
1.8
Question 2
2.7
National Nov 2002
Question 3
C4H8
bromine
B.
D.
O
E.
H
C
O
H
H
C
C
H
H
ethane
ethanoic acid
F.
H
H
3.1
H
C
O
H
1
National Nov 2003
Consider the following formulae of organic compounds:
A.
B.
C.
D.
H
(3)
By making use of structural formulae, write down an equation of
an addition reaction that occurs between two of the substances
from the list.
(4)
[21]
Consider the following chemical substances A to G
A.
C.
(2)
C2H4
C2H6
C2H2
HCCl3
3.1.1
3.1.2
3.1.3
3.1.4
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
Write down the equation, using structural formulae, for the
reaction of compound A with bromine.
(4)
Compound B does not react with bromine as easily as compound
A. Explain why this is so.
(2)
To which group (class) of compounds does compound D belong?
(2)
Write down the IUPAC name for compound D.
(2)
A.
B.
C.
D.
E.
4.2.1
4.2.2
4.2.3
4.2.4
Ethanol is oxidized by potassium dichromate to form compound
X. Compound X then reacts with ethanol, in the presence of a
suitable catalyst, to produce an organic compound Y.
By what process is ethanol produced from starch?
(2)
Write down the structural formula for compound X.
(2)
Write down the NAME of the functional group present in
compound X.
(2)
Write down the IUPAC name for compound Y.
(2)
Write down the FORMULA of the catalyst used in the reaction
between compound X and ethanol.
(2)
[20]
Question 4
HCOOH
CH3COOH
HCOOCH2CH3
CH3CH2COOH
CH3CH2CH2OH
Write down the structural formula for an isomer of E.
Write down the IUPAC (systematic) name of B.
Write down the functional group of C.
Write down the formula of the organic acid used in the
preparation of C.
Question 5
5.1
(2)
[18]
National Nov 2004
For the following compound write:
H
H
H
National March 2004
(2)
(2)
(2)
C
C
H
CH3
C
H
4.1
A certain hydrocarbon contains two hydrogen atoms for every
carbon atom. The relative formula mass of the compound is 42.
5.1.1
5.1.2
its IUPAC name.
the structural formulae of two of its isomers
4.1.1
Write down the molecular formula for this compound.
5.2
The gas in an oxy-acetylene blowtorch burns in an excess of
oxygen. Write a balanced equation for the reaction taking place.
(3)
(2)
This hydrocarbon is bubbled through a solution of bromine in an
organic solvent.
4.1.2
4.1.3
4.1.4
What is observed in this experiment.
(2)
What type of reaction took place.
(2)
Use structural formulae to write down an equation that explains
the observation in question 4.1.2.
(4)
4.2
Consider the following organic compounds:
2
(2)
(4)
5.3
Consider the following flow-diagram of a chemical process that
leads to the formation of an ester:
A
oxida
tion
Ethanoic
acid
6.3
Consider the following unsaturated hydrocarbon:
methanol
H
H
H
H
H
C
C
C
C
H
H
H
6.3.1 Give the IUPAC name for this compound.
(2)
6.3.2 Give the balanced equation for the combustion of this compound
in excess oxygen.
(4)
[16]
Ester
+
Question 7
B
IEB Nov 2004
The table below gives boiling points of ten organic compounds.
5.3.1
5.3.2
5.3.3
Ethanoic acid is obtained through the oxidation of compound A.
Write the NAME of compound A
(2)
Write the NAME of compound B.
(2)
Give the IUPAC name and structural formula of the ester formed.
(4)
[17]
Question 6
IEB Nov 2003
6.1
What is a homologous series?
6.2
A mixture of Ethanoic acid and methanol is warmed in the
presence of concentrated sulphuric acid.
Using structural formulae give an equation for the reaction which
takes place.
(6)
What is the IUPAC name of the organic compound formed in this
reaction?
(2)
6.2.1
6.2.2
(2)
COMPOUND
FORMULA
BOILING POINT
ºC
1
methane
CH4
-164
2
ethane
C2H6
-88
3
propane
C3H8
-42
4
butane
C4H10
0
5
pentane
C5H12
36
6
methanol
CH3OH
65
7
ethanol
C2H5OH
78
8
propan-1-ol
C3H7OH
98
9
propan-1,2-diol
propan-1,2,3 triol
CH3CHOHCH2OH
189
CH2OHCHOHCH2OH
290
10
The following questions refer to the compounds shown in the above
table.
3
7.1
To which homologous series do the following compounds belong?
7.1.1 Compounds 1,2 and 3
(2)
7.1.2 Compounds 6, 7 and 8
(2)
7.2
Which of the above compounds are gases at room temperature?
(2)
7.3
What causes the trend of increasing boiling points of compounds
1 to 5?
(5)
7.4
Despite the fact that the length of the carbon chain in compounds
8, 9 and 10 is the same, the boiling point of propan-1,2,3-triol is
much higher than the boiling point of propan-1-ol. What is
responsible for this large difference in boiling point?
(2)
7.5
Give the IUPAC name and the structural formula of an isomer of
butane.
(3)
7.6
Which one of the above substances is used as a reactant in the
preparation of the ester ethylmethanoate?
(2)
7.7
Using structural formulae, write an equation for the reaction which
produces ethylmethanoate.
(4)
[17]
4