The hybridization of the carbon atoms in from left to right is: — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

$C_1$ and $C_2$ are connected by a triple bond, making them both $sp$ hybridized. $C_3$ and $C_4$ form a double bond, so they are $sp^2$ hybridized. $C_5$ forms only single bonds, meaning it is $sp^3$ hybridized.