O-P O Observed Rotation Oil Olefin Oligopeptide Oligosaccharide Omega-3 Fatty Acid Omega-6 Fatty Acid Optical Activity Optically Active Optically Inactive Optical Purity Optical Resolution Optical Rotation Organic Cyanide Organocopper Compound Organocopper Reagent Organocuprate Organolithium Compound Organolithium Reagent Organomagnesium Compound Organomagnesium Reagent Organometallic Compound Organozinc Compound Organozinc Reagent Ortho Carbon Ortho Disubstituted Benzene Ortho, Para Directing Group Oxidation Oxidation Number Oxidation-Reduction Reaction Oxidative Addition Oxidative Insertion Oxidative Substitution Oxidizing Agent Oxime Oxirane Oxoacid Oxonium Ion Oxymercuration Oxymercuration-Demercuration Oxymercuration-Reduction Ozonide Ozonolysis P Para Carbon Para Disubstituted Benzene Parallel Overlap Parent Cycloalkane Pascal’s Triangle PCC Pentose Peptide Peptide Bond Peptide Linkage Peracid Percent Transmittance Perhaloalkane Pericyclic Reaction Periodate Ester Periodic Acid Peroxyacid Peroxycarboxylic Acid Phenol Phenol Group Phenoxide Ion Phenyl Group Phosphoglyceride Phospholipid Phosphorus Ylide Photolysis Pi Bond Pinacol Rearrangement pKa Plane of Symmetry Plane-Polarized Light Polarimeter Polycycloalkane Polyene Polynuclear Aromatic Hydrocarbon Polypeptide Polysaccharide Positional Isomers Post-Translational Modification Precession Frequency Precise Mass Primary Alcohol Primary Alkyl Carbocation Primary Alkyl Radical Primary Allylic Carbocation Primary Allylic Radical Primary Amide Primary Amine Primary Amine Group Primary Ammonium Ion Primary Ammonium Salt Primary Benzylic Carbocation Primary Benzylic Radical Primary Carbon Primary Hydrogen Prochiral Carbon Prochiral Center Prochirality Center Prochiral Molecule Propagation Prostoglandin Protecting Group Protection Step Protein Protic Solvent p-Toluenesulfonate Group p-Toluenesulfonic Acid p-Toluenesulfonyl Chloride p-Toluenesulfonyl Group Pyramidal Inversion Pyranose Pyranose Ring Pyranoside Pyridinium Chlorochromate
