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Which of the following is an isomer of ethyl propanoate (CH₃CH₂COOCH₂CH₃)? A - Scottish Highers Chemistry - Question 10 - 2017
Question 10
Which of the following is an isomer of ethyl propanoate (CH₃CH₂COOCH₂CH₃)? A. Methyl propanoate B. Pentan-2-one C. Pentanoic acid D. Pentane-1,2-diol
Worked Solution & Example Answer:Which of the following is an isomer of ethyl propanoate (CH₃CH₂COOCH₂CH₃)? A - Scottish Highers Chemistry - Question 10 - 2017
Step 1
Identify the Structure of Ethyl Propanoate
Answer
Ethyl propanoate has the chemical formula C₅H₁₀O₂ and consists of an ethyl group (C₂H₅) and a propanoate group (C₃H₅O₂). Its structure can be represented as:
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C₂H₅-C-COO
This gives a clear idea of the components that make up the molecule.
Step 2
Analyze Each Option for Isomerism
Answer
To determine which of the options is an isomer, we need to evaluate each compound against the structure of ethyl propanoate:
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A. Methyl propanoate (C₄H₈O₂): This is not an isomer because it lacks the ethyl component (C₂H₅).
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B. Pentan-2-one (C₅H₁₀O): This compound has a ketone functional group and is not structurally similar enough to ethyl propanoate.
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C. Pentanoic acid (C₅H₁₀O₂): This is an isomer since it has the same molecular formula (C₅H₁₀O₂) but different structural properties; it contains a carboxylic acid functional group instead of an ester.
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D. Pentane-1,2-diol (C₅H₁₂O₂): This compound contains two alcohol functional groups and is also not an isomer.
Through this analysis, option C is confirmed as an isomer.