The following structure is a representation of cytosine, a...

Name: Problem 8, Chapter 7: Chemistry
Uploaded: 2020-04-01T08:05:22-08:00
Duration: 1 min 34 s
Channel: Sam Limsuwannarot
Description: The following structure is a representation of cytosine, a constituent of the DNA found in all living cells. Only the connections between atoms are shown; multiple bonds are not indicated. Give the formula of cytosine, and complete the structure by showing where the multiple bonds and lone pairs are located (red = O, gray = C, blue = N, ivory = H).

The following structure is a representation of cytosine, a constituent of the DNA found in all living cells. Only the connections between atoms are shown; multiple bonds are not indicated. Give the formula of cytosine, and complete the structure by showing where the multiple bonds and lone pairs are located (red = O, gray = C, blue = N, ivory = H).

Key Concepts

Aromaticity in Heterocyclic Compounds

Aromaticity is a concept that describes the enhanced stability of cyclic, planar molecules with delocalized pi electron systems, often found in heterocyclic compounds such as nucleobases. Recognizing aromatic character is important because it explains key properties of the molecule, including its resonance stabilization and reactivity in biological systems.

Multiple Bonds

Multiple bonds, such as double and triple bonds, are key in understanding the electron sharing between atoms. They are represented as multiple lines between atoms in a structural diagram, indicating areas of higher electron density and contributing to the molecule's reactivity, stability, and overall geometry.

Lone Pairs

Lone pairs refer to pairs of valence electrons that are not shared between atoms in a bond. In drawing the complete structure of a molecule, placing lone pairs accurately is essential since they affect molecular shape, reactivity, and the ability to participate in hydrogen bonding or other intermolecular interactions.

Lewis Structures

A Lewis structure is a diagrammatic way to represent the bonding between atoms and the lone pairs of electrons in a molecule. Constructing a Lewis structure helps illustrate how atoms are connected and the distribution of electrons, including the placement of single, double, or triple bonds, which is critical for predicting the molecule's chemical behavior.

Molecular Formula

This concept involves determining the overall count and type of atoms in a molecule based on its chemical structure. In organic chemistry, the molecular formula provides a concise representation by listing the number of each element present, which is fundamental for identifying the compound and understanding its stoichiometry.

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