Which of the following carbanions is the most stable based on the hybridization state of the carbon — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

The stability of a carbanion increases with the electronegativity of the carbon atom, which increases with % s-character. $sp$ hybridized carbon (50% s) in $HC\equiv C^-$ is more electronegative than $sp^2$ (33.3% s) and $sp^3$ (25% s), making it the most stable.