MOGALAKWENA DISTRICT
PHYSICAL SCIENCES
GRADE 12
NATIONAL SENIOR CERTIFICATE
ACCELERATED ASSESSMENT
ORGANIC REACTIONS
2025 TERM 1
MARKS: 40
DURATION: 40 Min
INSTRUCTIONS
1. Answer all questions.
2. Non-programmable calculators may be used.
3. Number the questions correctly according to the numbering system used in
this activity.
This question paper consists of THREE topics and FIVE pages including the
cover page. Each topic MUST be assessed at the beginning of that topic.
Physical Sciences
2025 Term1 Accelerated Assessment: ORGANIC REACTIONS
Grade 12
TOPIC: ORGANIC REACTIONS
MARKS: 40
DURATION: 40 Min
QUESTION 1
(2)
1.1 A test tube contains a liquid hydrocarbon.
When bromine water (Br2) is added to the test tube, the mixture decolourises
IMMEDIATELY. Which ONE of the following combinations correctly identifies the
COMPOUND and the TYPE OF REACTION that takes place in the test tube?
1.2 Which ONE of the following alkanes is likely to produce 1 mole carbon dioxide
(2)
and 2 moles of water when 1 mole of the alkane is burned in excess oxygen?
A Methane
B Ethane
C Propane
D Butane
(2)
1.3 Consider the reaction 1 and 2 below. Compound X is an organic compound
What type of reaction is REACTION 2
A Hydrolysis
B Hydration
C Halogenation
D Hydrohalogenation
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Mogalakwena District
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Physical Sciences
2025 Term1 Accelerated Assessment: ORGANIC REACTIONS
Grade 12
QUESTION 2
Most organic compounds can undergo different reactions to produce a variety of
organic compounds. Some incomplete reactions are represented below.
2.1
Consider reaction A. Write down the type of reaction that takes place.
2.2
Reaction B represents a hydration reaction.
(1)
2.2.1. Define the hydration reaction.
(2)
2.2.2
Write down the name or formula of the catalyst used for this reaction.
(1)
2.3
During reaction C, a specific rule is followed to determine the major product
when HBr is added.
2.3.1
Write down TWO conditions for this reaction.
(2)
2.3.2
Use structural formulae and write down the balanced equation for this
(3)
reaction.
2.4
Identify the type of reaction taking place at:
2.4.1
Reaction D
(1)
2.4.2
Reaction F
(1)
2.5
Reaction E is a hydrogenation reaction.
2.5.1
Write down the TWO reaction conditions for this reaction.
(2)
2.5.2
This reaction is widely used in industry. Name ONE use of
(1)
hydrogenation in the food industry.
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Mogalakwena District
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Physical Sciences
2025 Term1 Accelerated Assessment: ORGANIC REACTIONS
Grade 12
QUESTION 3:
Alkenes undergo addition reactions. Reaction I and II given below represent the
equations of incomplete addition reactions. Compound P and Q are organic
products.
3.1.1
Write down the TYPE of addition reaction represented in:
(a) Reaction I
(1)
(b) Reaction II
(1)
3.1.2
Structural formula of compound P.
(2)
3.1.3
IUPAC name of compound Q.
(2)
3.2
Halo-alkanes can either undergo ELIMINATION or SUBSTITUTION in the
presence of a strong base. Study the flow diagram below which represents two
different reactions
Write down the:
3.2.1
TYPE of reaction will take place when 2-bromo-2-methylbutane is heated
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(1)
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Physical Sciences
2025 Term1 Accelerated Assessment: ORGANIC REACTIONS
Grade 12
in the presence of diluted strong base?
Choose either ELIMINATION or SUBSTITUTION
3.2.2
NAME or FORMULA of the strong base.
(1)
3.2.3
Balanced chemical equation for the reaction using STRUCTURAL
(4)
FORMULAE that takes place when 2-bromo-2-methyl butane reacts with
concentrated strong base.
3.2.4
IUPAC name of the compound Y
(2)
3.3.
An ester is formed when ethanoic acid and methanol is heated in the presence of
a catalyst.
Write down the:
3.3.1
NAME or FORMULA of the catalyst used.
(1)
3.3.2
Balanced chemical equation for the reaction using STRUCTURAL FORMULAE.
(5)
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TOTAL MARKS = [40]
Mogalakwena District
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