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

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