4.1 Write down the NAME or TYPE of reaction represented by the following letters:
4.1.1 A
4.1.2 B
4.1.3 C
4.2 Apart from the alkene, another reactant and a catalyst are needed in reaction A - NSC Technical Sciences - Question 4 - 2020 - Paper 2
Question 4
4.1 Write down the NAME or TYPE of reaction represented by the following letters:
4.1.1 A
4.1.2 B
4.1.3 C
4.2 Apart from the alkene, another reactant and a catal... show full transcript
Worked Solution & Example Answer:4.1 Write down the NAME or TYPE of reaction represented by the following letters:
4.1.1 A
4.1.2 B
4.1.3 C
4.2 Apart from the alkene, another reactant and a catalyst are needed in reaction A - NSC Technical Sciences - Question 4 - 2020 - Paper 2
Step 1
4.1.1 A
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Answer
The reaction represented by A is an addition/hydration reaction. This type of reaction typically involves the addition of water to an alkene.
Step 2
4.1.2 B
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Answer
B represents a addition/hydration reaction, specifically hydrohalogenation. In this reaction, a hydrogen halide is added to the double bond of the alkene.
Step 3
4.1.3 C
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Answer
The reaction type for C is substitution/halogenation. This reaction involves the substitution of one group in the molecule with a halogen.
Step 4
4.2.1 Other reactant
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Answer
The other reactant in reaction A is water (H₂O).
Step 5
4.2.2 Catalyst
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Answer
The catalyst used in reaction A can be dilute sulphuric acid (H₂SO₄) or dilute phosphoric acid (H₃PO₄).
Step 6
4.3
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Answer
The balanced chemical equation for reaction B involving the addition of HBr to the alkene can be represented as:
H2C=CH2+HBr→H3C−CH2Br
Step 7
4.4
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Answer
Two reaction conditions for reaction C are:
Moderate/warm temperature, or mild heat (accept UV light).
No water (but can accept H₂SO₄ or NaBr).
Step 8
4.5
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Answer
The balanced equation for the reaction of the alkene in excess oxygen can be represented as:
C2H4+3O2→2CO2+2H2O+energy
Step 9
4.6
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Answer
The NAME of the organic compound that can be used as a monomer of polythene is ethene (ethylene).
