What is the hybridization state of the central carbon atom in propa-1,2-diene (allene)? — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

The structure of propa-1,2-diene is $CH_2=C=CH_2$. The central carbon is bonded to two other carbons via double bonds, meaning it forms 2 $\sigma$ bonds and 2 $\pi$ bonds. A steric number of 2 corresponds strictly to $sp$ hybridization.