Carbonyl Structure ● Carbon is sp2 hybridized. C=O bond is shorter,stronger,and more polar than C=C bond in alkenes. length energy ketone C=0 bond 1.23A 178 kcal/mol (745 kJ/mol) alkene C=C bond 1.34A 146 kcal/mol (611 kJ/mol) => Chapter 18 3Chapter 18 3 Carbonyl Structure • Carbon is sp2 hybridized. • C=O bond is shorter, stronger, and more polar than C=C bond in alkenes. =>