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Chemistry Exam Paper: Organic Chemistry Questions

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1
Hexan-3-ol is an alcohol.
CH3
CH2
CH
CH2
CH2
CH3
OH
hexan-3-ol
hexan-3-ol?
A
2
9
B
10
C
18
D
19
An organic compound, P, is dissolved in water. The concentration of the solution is 0.1
and the pH is 3.
mol / dm3
A solid is added to the solution and effervescence is seen.
Which equation could represent this reaction?
3
4
A
2CH3CO2H(aq) + Mg(s)  (CH3CO2)2Mg(aq) + H2(g)
B
2CH3CO2H(aq) + 2Mg(s)  2CH3CO2Mg(aq) + H2(g)
C
2CH3CO2H(aq) + K2CO3(s)  (CH3CO2)2K(aq) + CO2(g) + H2O(l)
D
2HCl (aq) + K2CO3(s)  2KCl (aq) + CO2(g) + H2O(l)
Which equation shows the reaction of ethane with chlorine in the presence of ultraviolet light?
A
C2H6 + Cl 2  C2H6Cl 2
B
C2H6 + Cl 2  C2H4Cl 2 + H2
C
C2H6 + Cl 2  C2H5Cl + HCl
D
C2H6 + Cl 2  2CH3Cl
The table shows some of the fractions obtained by the fractional distillation of petroleum and their
uses.
fraction
use
1
bitumen
making roads
2
kerosene / paraffin
chemical feedstock
3
naphtha
jet fuel
4
refinery gases
heating and cooking
Which rows are correct?
A
1 and 2
B
1 and 4
C
2 and 3
D
3 and 4
34 What is the displayed formula of propyl methanoate?
A
H
O
B
O
H
H
H
C
C
C
C
H
H
H
H
H
H
C
O
H
H
C
C
C
H
H
H
C
O
H
C
C
H
H
C
C
C
H
H
H
H
H
The structures of three compounds, W, X and Y, are shown.
H
H
H
C
C
O
H
H
OH
CH3
C
O
O
C
H
CH3
CH3
CH2
COOH
CH3
OH
C
OH
W
X
Y
Which statements about these three compounds are correct?
A
1
W and Y are both alcohols and X is a carboxylic acid.
2
W, X and Y have the same molecular formula.
3
W and Y are structural isomers of each other.
1 and 2 only
H
D
H
H
33
O
B
1 and 3 only
C
2 and 3 only
D
37 The structure of an ester is shown.
H
H
C
H
O
C
O
H
H
H
C
C
C
H
H
H
Which two compounds react to form this ester?
A
butan-1-ol and methanoic acid
B
ethanol and propanoic acid
C
propan-1-ol and ethanoic acid
D
propan-1-ol and methanoic acid
H
1, 2 and 3
CH2OH
34 What is the structural formula of propyl methanoate?
A
CH3COOCH2CH2CH3
B
CH3COOCCH2CH3
C
CH3CH2COOCH3
D
CH3CH2CH2OOCH
35 Which statement about ethane is correct?
A
Each ethane molecule contains exactly seven bonds, all of which are single covalent bonds.
B
Ethane is a member of the homologous series of alkanes, a family of unsaturated
hydrocarbons.
C
The equation for the complete combustion of ethane is C2H6 + 3O2 → 2CO2 + 3H2O.
D
When a molecule of ethane reacts with chlorine, one hydrogen atom is replaced by a
chlorine molecule.
36 Isoprene is an alkene which is commonly found in plants.
Which properties does isoprene have?
A
1
It burns in air.
2
It can form polymers.
3
It decolourises aqueous bromine.
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
34 The displayed formulae of two organic compounds are shown.
1
2
H
H
C
O
O
H
H
H
What are the names of these compounds?
compound 1
compound 2
A
methanoic acid
ethyl methanoate
B
methanoic acid
methyl ethanoate
C
methanol
ethyl methanoate
D
methanol
methyl ethanoate
C
O
H
H
C
C
H
H
H
32 Which compounds are in the same homologous series?
A
CH3CH2CH2CH3, CH3CHCHCH3 and CH3CH(CH3)CH3
B
CH2CHCH3, CH3CH2CHCH2 and CH2CHCH2CH3
C
CH3CHOHCH3, CH3CH2CH2OH and CH3CH2COOH
D
CH3CH2CH3, CH3CH2CH2CH3 and CH2CHCH2CH2CH3
33 The diagrams show four structures of C4H8.
1
2
H
C
C
H
C
H
H
C
H
4
C
H
H
C
H
C
H
H
H
H
H
H
3
H
H
H
C
C
H
H
H
C
H
C
H
H
C
H
C
H
H
C
H
H
C
H
C
H
H
H
Which structures represent the same molecule?
A
1 and 2
B
1 and 3
C
2 and 3
D
2 and 4
35 Two products of the separation of petroleum are the lubricating oil fraction and the
kerosene / paraffin fraction.
Which statement is correct?
A
The lubricating oil fraction is more viscous than the kerosene / paraffin fraction.
B
The lubricating oil fraction is more volatile than the kerosene / paraffin fraction.
C
The lubricating oil fraction has lower boiling points than the kerosene / paraffin fraction.
D
Molecules in the lubricating oil fraction have smaller chain lengths than molecules in the
kerosene / paraffin fraction.
36 An incomplete equation for the reaction of propane with chlorine is shown.
C3H8 + Cl 2  C3H7Cl + X
A student writes three statements about this reaction.
1
The activation energy for this reaction is provided by ultraviolet light.
2
C3H7Cl has two different structural formulae.
3
X is an acidic gas.
Which statements are correct?
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
13
37 Glycerol is an alcohol with three –OH groups per molecule.
glycerol
H
H
H
H
C
C
C
H
OH OH OH
What is the equation for the combustion of glycerol?
A
C3H8O 3 + 5O 2  3CO 2 + 4H 2O
B
2C 3H8O 3 + 3O 2  6CO 2 + 8H 2
C
2C 3H8O 3 + 7O 2  6CO 2 + 8H 2O
D
4C 3H5O3 + 11O 2  12CO 2 + 10H 2O
VII ).
38 Compound X decolourises acidified aqueous potassium manganate(
Compound X has the empirical formula C
2H 5O.
Some possible structures of X are shown.
1
H
2
H
H
C
C
H
H
HO
OH
H
H
H
H
C
C
C
C
H
H
OH H
3
HO
H
4
H
H
H
H
C
C
C
C
H
H
H
H
H
OH
H
H
H
C
C
C
H
H
H
O
C
OH
Which structures could be correct for compound X?
A
1, 2 and 3
B
1 only
C
2 and 3 only
D
3 and 4
39 Which statement is correct?
A
A filtrate is left on the filter paper during filtration.
B
A saturated solution contains only substances with single bonds.
C
A solute is a substance that dissolves a solvent.
D
A solution can never be described as pure.
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5070/11/O/N/23
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