Choose the correct reagents for the following conversion. 1. Correct reagent(s) for Step I [Select] 2. Correct reagent(s) for Step II [Select] 3. Correct reagent(s) for Step III [Select] 4. Correct reagent(s) for StepIV [Select] Br Br || [Select] H2/Pd/C H2/Lindlar catalyst Na/NH3(1) ||| IV
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.
![**Title: Understanding Reagents for Organic Conversion Steps**
**Choose the Correct Reagents for the Following Conversion:**
1. **Correct reagent(s) for Step I:**
- [ Select ]
2. **Correct reagent(s) for Step II:**
- [ Select ]
3. **Correct reagent(s) for Step III:**
- [ Select ]
4. **Correct reagent(s) for Step IV:**
- [ Select ]
- Dropdown options: H₂/Pd/C, H₂/Lindlar catalyst, Na/NH₃(l)
**Diagram Details:**
- The image depicts a series of chemical transformations involving an organic compound, with four numbered steps (I-IV).
- **Step I:** Transformation involves a starting organic structure featuring a bromine substituent.
- **Step II:** The structure features an alkyne group.
- **Step III:** The compound undergoes further transformation, maintaining the alkyne group.
- **Step IV:** The alkyne group is converted into an alkene.
The task is to select appropriate reagents for each step to achieve the desired chemical transformations. The dropdown menu provides different reagent options for Step IV.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd28bb5a8-7114-481e-95e9-134d2c6aa143%2Fc6e1f495-5cd1-49a8-bcd7-cc6a55a3c487%2Fcigwhwg_processed.jpeg&w=3840&q=75)
![**Organic Chemistry Conversion Problem**
**Task:**
Choose the correct reagents for the following conversion.
1. **Correct reagent(s) for Step I**: [Select]
2. **Correct reagent(s) for Step II**: [Select]
3. **Correct reagent(s) for Step III**:
- Options:
1. Na/NH₃(l) 2. CH₃Br
2. NaNH₂ 2. CH₃Br
3. Na/NH₃(l) 2. CH₃OH
4. **Correct reagent(s) for Step IV**: [Select]
**Chemical Transformation Process:**
The diagram illustrates a four-step chemical conversion sequence:
- **Step I**: A cyclic compound with a bromine substituent on a saturated carbon adjacent to a double bond.
- **Step II**: Conversion to a different cyclic compound structure.
- **Step III**: Further modification resulting in a terminal alkyne.
- **Step IV**: Final conversion leading to a different cyclic compound with a terminal alkene.
**Instructions:**
Use the dropdown menus to select the appropriate reagents for each step to achieve the desired chemical transformations depicted in the diagram.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd28bb5a8-7114-481e-95e9-134d2c6aa143%2Fc6e1f495-5cd1-49a8-bcd7-cc6a55a3c487%2Fyxcdazq_processed.jpeg&w=3840&q=75)
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