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.
![### Chemistry Exercises
#### Question 5
**The approximate C-C-C bond angle in propyne is:**
*Answer space provided.*
#### Question 6
**Give the IUPAC name for the following compound:**
Chemical structure showing a chain of five carbon atoms. From left to right:
- A bromine (Br) atom is attached to the second carbon.
- The third carbon has a single hydrogen atom and is attached to a triple-bond with the fourth carbon.
- The triple bond between the third and fourth carbons indicates an alkyne.
*Answer space provided.*
#### Question 7
**Draw the rate-limiting step of the reaction shown below, using curved arrows to show the flow of electrons. If any lone pairs are involved in a reaction, their involvement must be explicitly shown.**
Chemical reaction:
- Reactant: A linear hydrocarbon with four carbon atoms and a triple bond between the second and third carbons.
- Reactants added: H₂O
- Reaction conditions: Presence of H₂SO₄
- Arrow indicating forward reaction.
*Answer space provided for drawing the mechanism.*](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2be0588c-31cb-4200-8b36-2995897a0279%2F85d9a729-6419-41b4-a68e-c59e31ac5a88%2Fqfo0rsu_processed.jpeg&w=3840&q=75)
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