functional group example pKa carboxylic acid CH:CO2H 5 99 B-diketone CH3CCH2CCH3 9 90 B-ketoester CH3CCH2COCHCH? 11 β-diester CH:OCCH2COCH 13 alcohol CH:CH2OH 16 0 aldehyde CH3CH 17 0 ketone CH3CCH3 19C H3 C O2 H 5 C H3 C CH2 CCH3 9 O O pKa C H3 C CH2 COCH2 C H3 11 O O C H3 OCCH2 COCH3 13 O O C H3 C H2 OH 16 carboxylic acid -diketone -ketoester -diester alcohol functional group example aldehyde CH3 CH 17 O ketone CH3 C CH3 19 O