The following statements (parts a-e) describe a specific reaction along with its regio- and/or stereo-control. Match the reaction conditions below (1-8) that correctly corresponds to the statement. Answer with 1, 2, 3, 4, 5, 6, 7, or 8. H₂ 1. Hg(OAc)2, H₂O 1. BH3, THF H₂ Lindlar's cat. Pd/C 2. NaBH4 2. H₂O2, H₂O, OH Condition 4 Condition 1 Condition 2 Condition 3 H3O+ HBr NaNH, HBr H₂O₂ Condition 7 Condition 8 Condition 6 Condition 5 a. Reaction condition for the reduction of an alkyne to a cis-alkene. b. Markovnikov addition of water to a double bond, with no carbocation rearrangement. c. Anti-Markovnikov addition of HBr to a double bond. d. Anti-Markovnikov addition of water to a double bond. e Reaction condition to change 1,2-dimethylcyclohexene into cis-1,2-dimethylcyclohexane.
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.
![**Chemical Reactions and Conditions**
The following statements (parts a-e) describe a specific reaction along with its regio- and/or stereo-control. Match the reaction conditions below (1-8) that correctly corresponds to the statement. Answer with 1, 2, 3, 4, 5, 6, 7, or 8.
**Reaction Conditions:**
1. Hg(OAc)₂, H₂O
2. NaBH₄
- Condition 1
1. BH₃, THF
2. H₂O₂, H₂O, OH⁻
- Condition 2
H₂
- Pd/C
- Condition 3
H₂
- Lindlar's cat.
- Condition 4
HBr
- H₂O₂
- Condition 5
H₃O⁺
- Condition 6
HBr
- Condition 7
NaNH₂
- Condition 8
**Statements:**
a. Reaction condition for the reduction of an alkyne to a *cis*-alkene.
**Answer: [ ]**
b. Markovnikov addition of water to a double bond, with no carbocation rearrangement.
**Answer: [ ]**
c. Anti-Markovnikov addition of HBr to a double bond.
**Answer: [ ]**
d. Anti-Markovnikov addition of water to a double bond.
**Answer: [ ]**
e. Reaction condition to change 1,2-dimethylcyclohexene into *cis*-1,2-dimethylcyclohexane.
**Answer: [ ]**
**Explanation of Diagrams and Graphs:**
There are no graphs or diagrams included with the text provided. The conditions and statements are textual and chemical equations formatted within the document. Each condition lists specific chemical reagents and under which state (i.e., whether in solution or catalyzed) they are applied.
The reactions involve common organic chemistry transformations used in synthesis and mechanisms studies. The task is to match these reactions to their described outcomes based on principles such as Markovnikov's and anti-Markovnikov's rules, as well as stereospecific hydrogenations.
**Note:**
Make sure to understand concepts such as regioselectivity (Markovnikov vs. anti-Markovnikov) and stereoselectivity (cis and](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2b8d26a8-87eb-4d55-9239-418c1bd04690%2Fb8b0ca85-5ba0-4f94-92f9-7075ccdc293b%2Fimp94cn_processed.jpeg&w=3840&q=75)
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