(B) $Propanone$ $(CH_3COCH_3)$ and $propanal$ $(CH_3CH_2CHO)$ have the same molecular formula,$C_3H_6O$.$Propanone$ contains a ketone functional group

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(B) $Propanone$ $(CH_3COCH_3)$ and $propanal$ $(CH_3CH_2CHO)$ have the same molecular formula,$C_3H_6O$.$Propanone$ contains a ketone functional group $(-CO-)$,whereas $propanal$ contains an aldehyde functional group $(-CHO)$.Since they possess the same molecular formula but different functional groups,they are classified as functional isomers.