Choose a molecular formula above that represents an organic compound below - NSC Physical Sciences - Question 2 - 2018 - Paper 2
Question 2
Choose a molecular formula above that represents an organic compound below. Write down only the letter (A to F) next to the question numbers (2.1.1 to 2.1.5), e.g. 2... show full transcript
Worked Solution & Example Answer:Choose a molecular formula above that represents an organic compound below - NSC Physical Sciences - Question 2 - 2018 - Paper 2
Step 1
2.1.1 A haloalkane
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Answer
The answer is A (C₂H₅Br), which represents a haloalkane due to the presence of bromine bonded to a carbon chain.
Step 2
2.1.2 An alcohol
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Answer
The answer is E (C₃H₈O), which represents an alcohol as it contains a hydroxyl (-OH) group.
Step 3
2.1.3 An unsaturated hydrocarbon
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Answer
The answer is B (C₂H₄), which represents an unsaturated hydrocarbon because it contains a double bond.
Step 4
2.1.4 An aldehyde
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Answer
The answer is C (C₄H₁₀O), which represents an aldehyde as it contains a carbonyl group (-CHO).
Step 5
2.1.5 A product of thermal cracking of compound C
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Answer
The answer is F (C₃H₆O₂), a product that could result from the thermal cracking of C (C₄H₁₀O), producing smaller organic compounds.
Step 6
2.2.1 The structural formula of a FUNCTIONAL isomer of F
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Answer
A functional isomer of F (C₃H₆O₂) could be shown as:
O
||
C - C - CH₃
|
O
This displays a structure having similar molecular formula but different functional groups.
Step 7
2.2.2 The IUPAC name of a FUNCTIONAL isomer of F
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The IUPAC name of a functional isomer of F could be Propanoic acid.
Step 8
2.3.1 Definition of a polymer
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A polymer is a large molecule composed of many repeating structural units (monomers) covalently bonded together.
Step 9
2.3.2 IUPAC name of the polymer
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The IUPAC name of the polymer made from compound B (C₂H₄) is Polyethylene.
Step 10
2.3.3 Balanced equation for the polymerisation reaction
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The balanced equation for the polymerisation of C₂H₄ can be represented as:
n C₂H₄ → (C₂H₄)ₙ
Where n indicates the number of moles of ethylene that react to form polyethylene.
Step 11
2.4 Name the type of reaction that takes place.
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The type of reaction that occurs is a substitution reaction, where compound A reacts with compound D.
