The letters A to E in the table below represent five organic compounds - NSC Physical Sciences - Question 2 - 2020 - Paper 2
Question 2
The letters A to E in the table below represent five organic compounds.
Compound D, write down the:
2.1.1 Homologous series to which it belongs
2.1.2 IUPAC name o... show full transcript
Worked Solution & Example Answer:The letters A to E in the table below represent five organic compounds - NSC Physical Sciences - Question 2 - 2020 - Paper 2
Step 1
For compound D, write down the homologous series to which it belongs
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Answer
Compound D, which is Pentan-2-one, belongs to the homologous series of ketones. Ketones are characterized by the presence of a carbonyl group (C=O) within the carbon chain.
Step 2
For compound D, write down the IUPAC name of a FUNCTIONAL ISOMER
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Answer
A functional isomer of compound D (Pentan-2-one) is 2-pentanone. Another option could be 3-pentanone, as both have the same molecular formula but different structures.
Step 3
Write down the IUPAC name of compound A
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The IUPAC name of compound A is 2-bromopentane. It contains a bromine atom on the second carbon of a five-carbon straight chain.
Step 4
Write down the STRUCTURAL FORMULA of compound E
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Answer
The structural formula of compound E (4-methylpent-2-yne) is:
CH3
|
CH3-C#C-CH2-CH3
This indicates a triple bond between the second and third carbon atoms and a methyl group attached to the fourth carbon.
Step 5
Write down the meaning of the term primary alcohol
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A primary alcohol is defined as an alcohol in which the -OH (hydroxyl) group is attached to a carbon atom that is bonded to only one other carbon atom. This means that the carbon attached to the hydroxyl group is at the end of the carbon chain.
Step 6
Write down the type of reaction that takes place when compound B reacts with compound X to form compound C
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The type of reaction that occurs is an esterification reaction or condensation reaction. This typically involves the reaction of the hydroxyl group (-OH) of the alcohol with a carboxylic acid to form an ester and water.
Step 7
Write down the IUPAC name of compound X
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Answer
Compound X is likely a carboxylic acid that reacts with compound B. A suitable example is acetic acid, which has the IUPAC name ethanoic acid. Thus, it can be inferred that compound X is ethanoic acid.
