Unshared, or lone, electron pairs play an important role in determining the chemical and physical properties of organic compounds. Thus, it is important to know which atoms carry unshared pairs. Use the structural formulas below to determine the number of unshared pairs at each designated atom. Be sure your answers are consistent with the formal charges on the formulas. please answer the following for both pictures 2) and 3) he number of unshared pairs at atom a is ___ The number of unshared pairs at atom b is ___ The number of unshared pairs at atom c is ___
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
Unshared, or lone, electron pairs play an important role in determining the chemical and physical properties of organic compounds. Thus, it is important to know which atoms carry unshared pairs.
Use the structural formulas below to determine the number of unshared pairs at each designated atom.
Be sure your answers are consistent with the formal charges on the formulas.
please answer the following for both pictures 2) and 3)
he number of unshared pairs at atom a is ___
The number of unshared pairs at atom b is ___
The number of unshared pairs at atom c is ___
![The image displays the molecular structure of an organolithium compound. Specifically, it features a lithium ion (Li⁺) and a methyllithium molecule.
* **Lithium Ion (Li⁺):** Represented as "Li⁺" on the left side of the image, indicating a positively charged lithium ion.
* **Methyllithium Molecule:**
- The central structure is composed of a carbon atom (C) bonded to three hydrogen atoms (H) arranged in a tetrahedral geometry to denote the methyl group.
- The carbon atom is additionally bonded to the lithium ion through a single bond.
- Each hydrogen atom is labeled with an "H".
- The carbon atom is labeled with a "C".
- The lithium ion is labeled with "Li" and a positive superscript to represent its positive charge.
This depiction is a typical way to represent the structure of organolithium compounds, commonly used in organic chemistry.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fada57e6a-5791-4444-becc-3f7724b89dd1%2F74ce57fc-2d7a-4140-94bf-3819039d9f65%2Fcujil8.gif&w=3840&q=75)
![This image shows the chemical structure of purine, a vital organic compound with significant biological importance. Purines are one of two types of nitrogenous bases found in nucleotides, which in turn are the building blocks of nucleic acids like DNA and RNA.
### Detailed Explanation of the Diagram:
1. **Chemical Structure:**
- *Double Ring Structure*: Purine consists of a double-ring system. It is composed of a six-membered pyrimidine ring fused to a five-membered imidazole ring.
- *Atoms and Bonds*: The rings include carbon (C), nitrogen (N), and hydrogen (H) atoms. The carbon atoms are represented by the vertices of the rings, and the nitrogen atoms are specifically marked with an 'N'.
2. **Numbering System:**
- The positions on the rings are often numbered to differentiate the atoms and specify locations for various substitutions. In the diagram, certain positions are labeled with letters (a, b, c, etc.), which are placeholders often used in educational contexts to highlight points of interest.
3. **Chemical Groups:**
- Specific hydrogen atoms (H) are attached to the carbon and nitrogen atoms at various positions.
- The sixth position on the nitrogen ring often carries significance in substitutions and modifications pertinent to biological molecules.
Purines play a crucial role in encoding genetic information and are significant in various biochemical processes such as cell signaling, regulation of enzyme activity, and energy transfer.
By understanding the structure of purines, students can appreciate their functional significance in biochemistry and molecular biology.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fada57e6a-5791-4444-becc-3f7724b89dd1%2F74ce57fc-2d7a-4140-94bf-3819039d9f65%2Fmevjkhi.gif&w=3840&q=75)
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