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We need to find the common name of the given compound:

We are given a compound in which $C=O$present at localid="1653105688508" $2^{nd}$position as functional group so compound is ketone. Also it contains four carbon atoms. So, IUPAC name of compound is $2-$Butanone. Hence, common name of compound is dimethyl ketone.

We need to find the common name of the given compound:

We are given a compound in which $C=O$present at $3^{rd}$position as functional group so it is ketone. Also it contains five carbon atoms. So, IUPAC name of compound is$3-$Pentanone. Hence, common name compound of is diethyl ketone.

We need to find the common name of the given compound:

We are given a molecule in which $-CHO$is present as functional group so compound in an aldehyde. Also molecule contains three carbon atoms . So name of compound is propanal. Common name of propanal is propionaldehyde.