Which of the following carbocations is fundamentally the least stable due to the specific hybridizat — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

The vinyl cation is located on an $sp$ hybridized carbon (or $sp^2$ with high s-character). Since $sp$ hybridized carbons are more electronegative, they hold their electrons tightly and do not readily tolerate a positive charge (electron deficiency), drastically destabilizing the carbocation.