C-C Single Bond

Definition

A C-C single bond is a covalent chemical bond formed between two carbon atoms, where each carbon contributes one electron to the shared electron pair. This type of bond is the most common and fundamental structural unit in organic chemistry, providing the backbone for a wide range of organic molecules and compounds.

5 Must Know Facts For Your Next Test

1. The C-C single bond is characterized by a sigma (\sigma) bond, formed by the overlap of sp^3 hybridized orbitals on the two carbon atoms.
2. C-C single bonds are relatively strong, with a bond dissociation energy of approximately 83-85 kcal/mol, making them resistant to cleavage.
3. Rotation around the C-C single bond is relatively free, allowing for the formation of different conformations, such as the staggered and eclipsed conformations in ethane.
4. The length of a C-C single bond is typically around 1.54 Angstroms, slightly longer than a C=C double bond (1.34 Angstroms) due to the lower bond order.
5. C-C single bonds play a crucial role in the formation of complex organic molecules, providing the structural framework for a vast array of compounds, including alkanes, alkenes, alkynes, and aromatic compounds.

Review Questions

• Explain the hybridization of the carbon atoms involved in a C-C single bond and how this affects the bond geometry.
  • In a C-C single bond, the carbon atoms are sp^3 hybridized, meaning each carbon contributes four hybrid orbitals formed by the mixing of the 2s and three 2p orbitals. This sp^3 hybridization results in a tetrahedral arrangement of the four bonds around each carbon atom, with bond angles of approximately 109.5 degrees. The C-C single bond geometry is therefore determined by the sp^3 hybridization, leading to a tetrahedral arrangement of the substituents around the carbon-carbon bond.
• Describe the conformational flexibility of the C-C single bond and explain how it relates to the concept of staggered and eclipsed conformations in the context of ethane.
  • The C-C single bond allows for free rotation around the bond axis, enabling the molecule to adopt different conformations. In the case of ethane (CH$_3$-CH$_3$), the two most stable conformations are the staggered and eclipsed conformations. The staggered conformation, where the hydrogen atoms on adjacent carbon atoms are as far apart as possible, is the most stable due to minimized steric interactions between the hydrogen atoms. The eclipsed conformation, where the hydrogen atoms on adjacent carbon atoms are aligned, is less stable due to increased steric repulsion. This conformational flexibility of the C-C single bond is crucial in understanding the three-dimensional structure and reactivity of organic molecules.
• Analyze the importance of the C-C single bond in the context of organic chemistry and its role in the formation of complex organic molecules.
  • The C-C single bond is the fundamental structural unit in organic chemistry, providing the backbone for a vast array of organic compounds. The relatively strong bond dissociation energy and the ability to rotate freely around the bond axis allow for the formation of diverse molecular structures, from simple alkanes to complex natural products and pharmaceuticals. The C-C single bond serves as the building block for the formation of longer carbon chains, branched structures, and cyclic compounds, enabling the synthesis of a wide range of organic molecules with diverse functional groups and properties. Understanding the properties and behavior of the C-C single bond is, therefore, essential for predicting the reactivity, stability, and conformations of organic compounds, which is crucial in the fields of organic synthesis, drug design, and materials science.

Related terms

Covalent Bond:

A chemical bond formed by the sharing of one or more pairs of electrons between two atoms, resulting in a stable configuration.

Hybridization:

The process of mixing atomic orbitals to form new hybrid orbitals, which are used to describe the bonding in molecules and compounds.

Conformations:

The three-dimensional arrangement of atoms in a molecule that can be interconverted without breaking any covalent bonds.