OChem Lab Final

For CHEM43A lab final

Jones Oxidation Test

• Red-Orange → Blue-Green

• Positive: 1°/2° Alcohols, Aldehydes

• Reagents: H2SO4, H2O

Lucas Test

• Cloudy w/ 2 layers

• Positive: 2°/3° Alcohols

• False Positives: Activated (Allylic) 1° Alcohols

• Reagents: HCl, H2O

2,4-DNP Test

• Clear Orange → Red-Orange Precipitate

• Positive: Ketones, Aldehydes

• False Positives: Amines

• Reagents: H2SO4, EtOH

Tollens Test

• Silver mirror effect OR black precipitate

• Positive: Aldehydes

• False Positives: Sugars, Acyloins, Hydroxylamines, Substituted Phenols

• Reagents: EtOH

3,5-Dinitrobenzoate Ester

• Alcohol derivative

• Pyridine: Acts as Solvent AND Base

2,4-Dinitrophenyl Hydrazone

• Aldehyde/Ketone Derivative

• HCl: Catalyst

• DMF: Solvent

Semicarbazone

• Aldehyde/Ketone Derivative

• NaOAc: pH Buffer and Nucleophile