Question

For the following molecule, choose two constitutional isomers that contain different functional groups: CH3CH2COOH.

Check all that apply.
HC
CH3
COOH

Answer 1

Two constitutional isomers of CH3CH2COOH that contain different functional groups are ethyl ethanoate, which includes an ester functional group, and propanal, which contains an aldehyde functional group.

Step-by-step explanation:

The molecule given in the question is CH3CH2COOH, which is propanoic acid, a molecule with the functional group carboxyl (-COOH). To find constitutional isomers with different functional groups, we look for other compounds that have the same molecular formula but different arrangements of atoms such that the functional groups change. For example, a constitutional isomer with a different functional group could be ethyl ethanoate which has the molecular formula C3H6O2 but includes the ester functional group (-COO-), rather than the carboxyl group. Another isomer could be propanal which also has the molecular formula C3H6O, but contains the aldehyde functional group (-CHO).

Answer 2

Constitutional isomers of CH3CH2COOH with different functional groups include propanal (CH3CH2CHO) with an aldehyde group, and ethyl acetate (CH3COOCH2CH3) with an ester group.

Step-by-step explanation:

The student's question asks for two constitutional isomers of CH3CH2COOH that contain different functional groups. Constitutional isomers are compounds with the same molecular formula but different connectivity of atoms within the molecule. Since CH3CH2COOH (propanoic acid) features a carboxyl group, the isomers must have the same number of carbons, hydrogens, and oxygens but arranged differently, including alternative functional groups.

An example of a constitutional isomer with a different functional group would be propanal (CH3CH2CHO), which contains an aldehyde group instead of a carboxyl group. Another example would be ethyl acetate (CH3COOCH2CH3), which contains an ester group. Both options present different functional groups compared to the carboxyl group in propanoic acid.