Which of the following is antiaromatic?

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) To determine if a compound is antiaromatic,it must satisfy the following conditions:$1$. It must be cyclic and planar.$2$. It must be fully conjug

Vedclass · Accepted Answer

Cyclopentadienyl cation

Vedclass · Answer

(B) To determine if a compound is antiaromatic,it must satisfy the following conditions:$1$. It must be cyclic and planar.$2$. It must be fully conjugated.$3$. It must have $4n$ $\pi$ electrons (where $n = 1, 2, 3, ...$).Let's analyze the options:$A$: Cyclopropenyl cation has $2$ $\pi$ electrons ($4n+2$ with $n=0$),so it is aromatic.$B$: Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ with $n=1$),so it is antiaromatic.$C$: Benzene has $6$ $\pi$ electrons ($4n+2$ with $n=1$),so it is aromatic.$D$: Cycloheptatrienyl cation has $6$ $\pi$ electrons ($4n+2$ with $n=1$),so it is aromatic.Therefore,the cyclopentadienyl cation is antiaromatic.

Similar Questions

Ethyl $3$-oxobutanoate and ethyl $3$-hydroxybut-$2$-enoate are ................... of each other.

Stereochemistry of the product is

The number of stereoisomers for $pent-3-en-2-ol$ is ...........

Which of the following compounds can exist in two different stereoisomeric forms?

The following molecule is fluorometholone,a steroidal anti-inflammatory agent. How many stereogenic centers does it contain?

Vedclass Test Series

Exam Paper Generator

Online Exam Module