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CH₃ CH₃ i) j) S k) H₃C CH₃ 1) m) CH₃CN n) C-H o) p) q) O O COH r) O s) t) OH OH 12.23 a) (E)-3-Oxo-4-hexenoic acid b) 4-Hydroxypentanal c) 3-Hydroxy-4-methoxybenzoio acid d) (E)-4-Oxo-2-butenamide 12.24 a) 3-Hexanone has a higher melting point than heptane because it is more polar. b) Cyclopentanol has a higher boiling point than cyclopentanone because it can form hydrogen bonds. c) 2-Phenylethanoic acid has a higher boiling point than methyl benzoate because it is more polar and can form hydrogen bonds. 199