Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![### Chemical Reactions in Organic Chemistry
**C. Alkene to Dibromo Compound Transformation**
- **Reactant**: The image shows an alkene structure with a double bond between two carbon atoms in the middle of a chain.
- **Product**: The transformation results in the addition of two bromine atoms across the former double bond, creating a dibromo compound.
- **Reaction Type**: This is an example of an electrophilic addition reaction where the double bond is broken and bromine atoms are added.
**D. Cyclopropene to Brominated Cyclopropane Transformation**
- **Reactant**: The structure is a cyclopropene, a three-membered hydrocarbon ring with a double bond.
- **Product**: The product shows a cyclopropane with a single bromine atom attached, indicating a single addition across the former double bond.
- **Reaction Type**: This transformation highlights the addition of bromine to a strained cyclic system.
**E. Cyclopentene to Bromohydrin Formation**
- **Reactant**: A cyclopentene, which is a five-membered ring with a double bond.
- **Product**: The resulting structure is a bromohydrin, where one bromine and one hydroxyl (OH) group are added across the double bond.
- **Reaction Type**: This is an example of a halohydrin formation where both a halogen and an OH group are added to adjacent carbons.
These diagrams represent fundamental transformations in organic chemistry, illustrating the concept of addition reactions to unsaturated hydrocarbons.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F96568607-0a27-4408-ad79-e46bfe827e81%2F6fe594b2-0e93-44fd-806a-a8bc387ccbba%2Fd7t7er_processed.jpeg&w=3840&q=75)
![1. Provide reagents that can allow the transformation given.
**A.**
The reaction shows a cyclohexene (a six-membered carbon ring with one double bond) transforming into a cyclohexanol (a six-membered carbon ring with an alcohol group). The arrow between the two structures indicates the direction of the chemical transformation. Reagents need to be provided that can effect this transformation, possibly involving hydration of the alkene.
**B.**
The chemical structure on the left is a linear alkene with a triple bond (alkyne) midway along the carbon chain. This is being converted into an alkane with no double or triple bonds. Reagents need to facilitate the hydrogenation of the alkyne to an alkane.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F96568607-0a27-4408-ad79-e46bfe827e81%2F6fe594b2-0e93-44fd-806a-a8bc387ccbba%2Fj02h3w3_processed.jpeg&w=3840&q=75)
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