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.
![Consider the following sketches (1-8) representing molecular orbitals (MOs) obtained by combining the s and p atomic orbitals on two atoms. As usual, the white and grey lobes correspond to the opposite signs of the wavefunctions.
Sketches:
1. Depicts two overlapping lobes with opposite colors, indicating a potential antibonding interaction.
2. Shows an overlap between a large white lobe and a smaller grey lobe.
3. Displays two lobes with opposing orientations and colors, reflecting a node between them.
4. Features two lobes with a distinct divide at the center, suggesting antibonding interaction.
5. Similar to sketch 1 with opposite lobe signs.
6. Illustrates an overlap similar to sketch 2.
7. Exhibits two vertically aligned lobes, separated by a node.
8. Appears similar to sketch 4 with a node in the center.
Question:
Which of the above sketches correspond to antibonding sigma MOs?
Answer choices:
- 1, 2, 7, 8
- 3, 4, 5, 6
- 3, 7
- 4, 5, 6
- 1, 7, 8](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Faab01dc0-572f-4647-affc-231aefa5eea9%2F9f5ca007-cdad-4c58-b852-34dd229c8b15%2Fe4zc21f_processed.jpeg&w=3840&q=75)
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