Grade 12 Common Test – Organic Chemistry
August 2013
Examiner: DL
Time 45 min
Marks 40
Question One: Give one word or term for the following descriptions:
1.1 Elimination of H2O from an alcohol
dehydrolyisis
1.2 Reaction between an alcohol and a carboxylic acid
(1)
Esterification
(1)
1.3 Alkanes in which a hydrogen atom has been substituted by a halogen atom haloalkanes(1)
Question Two: Multiple choice questions write down the letter corresponding to the correct
answer on your answer script.
O
2.1
When the group
A
B
C
D
2.2
is present in a compound, the compound may be
propanal.
1-propanol.
propanone.
methyl ethanoate.
(3)
Which ONE of the following represents the products of the complete combustion of an
alkane?
A
B
C
D
2.3
C O
CO2 and CO
CO2 and H2O
CO and Heat
CO2 and H2O and Heat
(3)
Which ONE of the following compounds has the highest melting point?
A
B
C
D
CH3CH3
CH3CH2CH3
CH3CH2CH2CH3
CH3CH2CH2CH2CH3
(3)
Question Three: Answer the following Questions in full on your Answer script.
3.1
Write down the structural formulae and IUPAC names for the product(s)
formed when the following compounds react with each other:
CH2
CH2
CH3
CH2
CH
(3)
chlorohexane H3C
3.1.1 hexene and HCl
Cl
3.1.2 CH3 CH2 C
CH CH3 and HBr
3-bromo-3-methylpentane
CH3
3.2
(3)
CH3
CH2 C
The following equations represent chemical reactions:
H3C
Reaction 1: A + Br2
CH2
Br
CH3
CH3-CHBr-CH2Br
H2SO4
Reaction 2: CH3-CH2-CH2OH
A + H2O
3.2.1 Name the type of reaction in reaction 2.
elimination
(1)
3.2.2 Write down the structural formula for the organic compound A.
(2)
CH
H3C
CH2
3.2.3 To what homologous series of compounds does compound A belong?
Alkenes
(1)
Question Four:
4.1
Jan wants to investigate how molecular mass influences the boiling points of the first
eight straight chain alcohols.
4.1.1 Write down the structural formulae and IUPAC names of the structural
isomers of the alcohol containing three carbon atoms.
OH
H3C
CH2
CH
CH2
OH
propan-1- ol
H3C
CH3
propan-2- ol
(6)
4.1.2 Jan uses heptan-1-ol as one of the compounds in the investigation.
Which ONE of the isomers named in QUESTION 4.1.1 should he
use as a comparison for this to be a fair test? propan- 1 - ol
(1)
4.1.3 Explain the need for this choice in QUESTION 4.1.2.
(2)
He should use this isomer as it is also a primary alcohol and so the intermolecular forces
would not be changed by it being a secondary or tertiary alcohol but only by the
increase in the number of C atoms in the chain.
Question 5: The letters A to F in the table below represent six organic compounds.
A
B
C
Buta-1,3-diene
1-chlorobutan-2-one
Propan-1-ol
D
E
F
CH3
H H H
H
O
CH3 – C- OH
H–C–C–C–C–H
H H H H
5.1
Write down the LETTER that represents:
5.1.1 An alkane
E
5.1.2 A primary alcohol C
5.2
(1)
(1)
Write down the IUPAC name of:
5.2.1 F Ethanoic acid
(2)
5.2.2 D methylcyclohexane
(2)
5.3
Write down the structural formula of:
CH
5.3.1
A
H2C
CH2
(2)
CH
CH3
CH
5.3.2
a structural isomer of E
H3C
CH3
(2)
Conc H2SO4
5.4
CH3-OH + CH3COOH
CH3 – O – CO–CH3 + H2O
(4)
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