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  1. Carbonaceous Compound

    Linked via "double bonds"

    A carbonaceous compound is any chemical substance whose molecular structure is primarily organized around a backbone of carbon atoms (often incorporating hydrogen, oxygen, nitrogen, sulfur, and sometimes halogens or phosphorus). These compounds form the basis of organic chemistry, though the term "carbonaceous compound" is often employed in [astrochemistry](/entries/astrochemi…

  2. Carboxylate Oxygen

    Linked via "double bond"

    The carboxylate oxygen ($\text{COO}^-$) group is the deprotonated form of the carboxylic acid functional group ($\text{COOH}$). It features a trigonal planar geometry around the central carbon atom, characterized by resonance stabilization between the two oxygen atoms. This resonance delocalization imparts partial double bond character to both $\text{C-O}$ bonds, resulting in bond…

  3. Covalent Bonding

    Linked via "double bonds"

    In molecular orbital theory, AOs combine linearly to form bonding ($\sigma, \pi$) and antibonding ($\sigma^, \pi^$) MOs. The formation of a stable bond necessitates that the number of electrons occupying bonding orbitals exceeds those in antibonding orbitals. For diatomic molecules composed of elements from the second period, the ordering of energy levels is crucial. For elements up to nitrogen ($\text{N}_2$), th…

  4. D Limonene

    Linked via "double bonds"

    Reactivity and Stability
    D-Limonene exhibits characteristic alkene reactivity. The presence of the two distinct double bonds\—one endocyclic and one exocyclic—confers differential reactivity. The exocyclic isopropenyl group is sterically less hindered and typically reacts faster in radical chain reactions, although it is surprisingly recalcitrant to [nucleophilic attack](/entries/nucleophilic-atta…

  5. Electron Pair

    Linked via "double bond"

    Bonding Pairs (Shared Pairs)
    Bonding pairs, or shared pairs, occupy the inter-nuclear region and are mutually attracted by both atomic nuclei. The density of these pairs defines the bond order. For instance, a single bond contains one bonding pair, a double bond contains two, and a triple bond contains three.
    The stability conferred by a bonding pair is quantified by the [bond dissociation energy](/entries/bond-dissociation-energ…