Oxygen-Containing Organic Compounds — A/L Chemistry

Oxygenated organic functional groups (alcohols, phenols, carbonyls, carboxylic acids) are defined by the acidity of the O-H bond, the nucleophilic susceptibility of the carbonyl carbon, and nucleophilic addition-elimination pathways.

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1. Confirmatory Test Observations: Precise recorded observations for identification reagents: 2,4-DNP (orange/yellow precipitate for C=O), Tollens' (silver mirror for aldehydes), Lucas reagent (turbidity timing for 1°/2°/3° alcohols), and neutral FeCl3 (violet complex for phenols).
2. Acidity Hierarchy & Resonance: Systematic ranking of acidity (Carboxylic Acid > Phenol > Water > Alcohol) justified by conjugate base charge delocalization over oxygen and aromatic systems.
3. Addition-Elimination Mechanism: Clear stepwise arrow pushing for esterification and acyl chloride reactions showing tetrahedral intermediate formation and elimination of the leaving group.