(C) ketone functional group requires a carbonyl group $(C=O)$ to be bonded to two other carbon atoms. Therefore,the simplest ketone is propanone,which

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(C) ketone functional group requires a carbonyl group $(C=O)$ to be bonded to two other carbon atoms. Therefore,the simplest ketone is propanone,which contains $3$ carbon atoms. It is impossible to form a ketone with only $2$ carbon atoms because the carbonyl carbon must be flanked by two alkyl groups.