Carbonyl group structure: A functional group characterized by a carbon atom double-bonded to an oxygen atom (>C=O). The carbon is sp2 hybridized, forming a trigonal planar geometry with bond angles approximately 120°, as shown in the orbital diagram for the formation of the carbonyl group (see source). (Source)
Polarity of carbonyl group: The C=O bond is polarized due to oxygen's higher electronegativity, resulting in a partial positive charge on the electrophilic carbon and a partial negative charge on the nucleophilic oxygen. This polarization explains the reactivity of carbonyl compounds in nucleophilic addition reactions. The high dipole moment makes aldehydes and ketones more polar than ethers. (Source)
Resonance structures of the carbonyl group: The carbonyl group can be represented by two resonance forms—a neutral structure and a dipolar form—highlighting the delocalization of electrons. The dipolar form, with a positive charge on carbon and a negative charge on oxygen, explains the polarity and electrophilicity of the carbonyl carbon. (Source)
1. What is the carbonyl functional group characterized by?
2. Who developed the Gatterman-Koch reaction for synthesizing aromatic aldehydes?
3. What is the primary purpose of oxidizing primary alcohols with mild oxidants like PCC in preparation methods?
Carbonyl group — structure?
C=O double bond, sp2 hybridized carbon.
Aldehydes — nomenclature?
Named with -al suffix, chain numbered from aldehyde carbon.
Ketones — nomenclature?
Named with -one suffix, numbered from nearest carbonyl.
Preparation of aldehydes?
Oxidation of primary alcohols with PCC.
Preparation of ketones?
Oxidation of secondary alcohols with K₂Cr₂O₇.
Physical property — boiling point?
Higher than hydrocarbons, lower than alcohols.
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