Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![**Question 5**
**Which product is formed? Click on a letter A to D to answer.**
The image shows a chemical reaction where an alkyne with a phenyl group and a hydrogen atom reacts with 2 equivalents of hydrogen bromide (HBr). The structure of the alkyne reactant features a benzene ring attached to a carbon-carbon triple bond.
There are four possible products labeled A, B, C, and D:
- **Product A:** Shows a benzene ring connected to a carbon atom that is bonded to two bromine atoms and a single carbon chain.
- **Product B:** Displays a benzene ring connected to a carbon atom bonded to one bromine atom, which in turn is bonded to another carbon with a bromine atom.
- **Product C:** Depicts a benzene ring attached to a two-carbon chain with bromines on each carbon.
- **Product D:** Represents a benzene ring fused to a cyclopentane ring with bromine atoms on different carbon atoms of the cyclopentane ring.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff5306076-2d35-4889-8514-a0af824cbe60%2F9739997c-bb2f-4e1a-9cde-a668baa5c902%2Ffd9ifzv_processed.jpeg&w=3840&q=75)
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