(A) The molecular formula of pyruvic acid is $CH_3COCOOH$.It contains a methyl group $(-CH_3)$,a carbonyl group $(-CO-)$,and a carboxyl group $(-COOH)

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(A) The molecular formula of pyruvic acid is $CH_3COCOOH$.It contains a methyl group $(-CH_3)$,a carbonyl group $(-CO-)$,and a carboxyl group $(-COOH)$.Counting the carbon atoms: $1$ (in $CH_3$) + $1$ (in $CO$) + $1$ (in $COOH$) = $3$ carbons.Therefore,pyruvic acid is a $3$-carbon compound.