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.
![Which of the following statements are TRUE for covalent pi bonds? (Choose as many
as apply. Hint: There are 4 correct answers!)
Pi bonds arise from head-on overlap of two orbitals.
Pi bonds arise from sideways overlap of two orbitals.
The electron density in a pi bond is found above and below the axis between the two
bonded nuclei.
The electron density in a pi bond is found in between the two bonded nuclei.
A pi bond can exist independently; not every pi bond is accompanied by an associated
o bond.
Pi bonds always exist in conjunction with an associated o bond; they can never exist
independently.
The pi bonds in a molecule determine the shape of the molecule.
There can be more than one pi bond between two nuclei.
Every covalent bond contains at least one pi bond.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F24b9f8b5-43e1-4740-9397-f57d82895bb0%2Feee456e0-bca9-4119-864a-c1146199f293%2Fr2d1ku_processed.jpeg&w=3840&q=75)
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