Choose all compounds shown below (A-F) that can exist as pairs of cis-trans isomers: CH3CH2CH=C(CH3)2 CH3CH-C(CH3)CH2CH3 C BrCH=CHCI CH2=CHCH3 B D A O A B C D E OF BrCH2CH=CHCH2Br CH3CH=C(CH2CH3)2 F E
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.
![**Cis-Trans Isomerism in Alkenes**
**Question:**
Choose all compounds shown below (A-F) that can exist as pairs of cis-trans isomers:
1. A: BrCH=CHCl
2. B: CH₂=CHCH₃
3. C: CH₃CH₂CH=C(CH₃)₂
4. D: CH₃CH=C(CH₃)CH₂CH₃
5. E: BrCH₂CH=CHCH₂Br
6. F: CH₃CH=C(CH₂CH₃)₂
**Options to Select:**
- [ ] A
- [ ] B
- [ ] C
- [ ] D
- [ ] E
- [ ] F
**Explanation:**
Cis-trans isomerism, also known as geometric isomerism, occurs in alkenes when there are two different groups attached to each carbon atoms of the double bond. This allows for different spatial arrangements of the groups, leading to the possibility of distinct isomers.
In examining the structures provided, determine which compounds have the necessary conditions to exhibit cis-trans isomerism. Look for the presence of a carbon-carbon double bond with different substituents on each carbon to identify potential isomers.
**Note:** Not all the compounds listed can exist in cis and trans forms because the requirement of having two different groups on each of the doubly bonded carbons is not met in all the cases.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fffa86d8a-8d23-425a-8873-44693b5673b0%2Ff1247737-4452-4e55-aa85-dca2ffa2258e%2Fc2vuz7s_processed.jpeg&w=3840&q=75)
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