(A) The molecular formula for both acetone $(CH_3COCH_3)$ and propanal $(CH_3CH_2CHO)$ is $C_3H_6O$.Acetone contains a ketonic functional group $(>C=O

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(A) The molecular formula for both acetone $(CH_3COCH_3)$ and propanal $(CH_3CH_2CHO)$ is $C_3H_6O$.Acetone contains a ketonic functional group $(>C=O)$,while propanal contains an aldehydic functional group $(-CHO)$.Since they have the same molecular formula but different functional groups,they are classified as functional isomers.