The compound that is a structural isomer of CH3CH2COOH is

Question

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Question restatement: The compound that is a structural isomer of CH3CH2COOH is

Options:
 a. HCOOCH2CH3
 b. CH3COOCH2CH3
 c. CH3CH(OH)CH2OH
 d. CH3CH2CH2OH

Now, evaluate each choice in turn:

Option a: HCOOCH2CH3. This molecule is ethyl formate, an ester with the formula C3H6O2. The given reactant CH3CH2COOH (propanoic acid) also has the formula C3H6O2. Since both have identical molecular formula and share the same connectivity class (they are not the same compound, but they can be considered structural isomers, i.e., same formula but different bonding/connectivity), this option matches the criterion of being a structural isomer of CH3CH2COOH.

Option b: CH3COOCH2CH3. This compound is ethyl acetate, which contains four carbon atoms in total (two from acetyl CH3CO– and two from the ethyl CH2CH3 group), giving the formula C4H8O2. Because its carbon count differs from CH3CH2COOH (C3H6O2), it cannot be a structural isomer of CH3CH2COOH. The discrepancy in molecular formula rules this one out.

Option c: CH3CH(OH)CH2OH. This is a molecule with three carbons and two hydroxyl groups, i.e., a propanediol, with a formula around C3H8O2. While it has the same carbon count as propanoic acid, the presence and placement of two hydroxyl groups indicate a different functional group and connectivity. The formula suggests C3H8O2 rather than C3H6O2, so it is not a structural isomer of CH3CH2COOH.

Option d: CH3CH2CH2OH. This is propanol, an alcohol with formula C3H8O. Again, the hydrogen and oxygen counts differ from CH3CH2COOH, which has C3H6O2. Therefore, this is not a structural isomer of the given carboxylic acid.

Summary: Among all options, only option a (HCOOCH2CH3, ethyl formate) shares the same molecular formula as CH3CH2COOH and differs in connectivity, meeting the definition of a structural isomer. The other options either have a different carbon count or a different functional group, leading to different molecular formulas or connectivity patterns that disqualify them as structural isomers of CH3CH2COOH.

MUF0042 Chemistry Unit 2 - Semester 1, 2025 1.16 Quiz: Functional Groups

The compound that is a structural isomer of CH3CH2COOH is

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