Which free radical is the least stable? I’m thinking I. but I want to be sure. **Question: Which free radical would be least stable?**The image displays five molecular structures labeled I to V, each containing a free radical indicated by a dot. These are cyclic compounds, specifically radicals on cyclopentane rings.**Structures:**1. **I**: A cyclopentane ring with a free radical on a carbon atom adjacent to a double bond.2. **II**: A cyclopentane ring with a free radical on a carbon atom not adjacent to a double bond.3. **III**: A cyclopentane ring with a free radical on a carbon atom where the double bond is on the neighboring carbon.4. **IV**: A cyclopentane ring with a free radical directly attached to a carbon atom with a double bond.5. **V**: A cyclopentane ring with a free radical on the terminal carbon of a longer carbon chain.There is a set of options to choose which structure represents the least stable free radical:- ⃝ II- ⃝ III- ● I- ⃝ V- ⃝ IVIn this specific question, the answer marked by the user is **I**, indicating that structure I is considered the least stable free radical among the options.

Radical is reactive species of carbon. Carbon radical is electron deficient species. Electron donating groups increases stability of carbon radical. Order of stability of carbon radical Primary < secondary < tertiary < allylic. I - it is primary radical II - it is secondary radical III - it is allylic radical IV - it is allylic radical V- vinylic radical Vinylic radical is least stable as radical form on double bonded carbon. So correct answer is V V