What is the calculated spin multiplicity () of a singlet carbene? — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

Spin multiplicity $M = 2S + 1$. In a singlet carbene, the two non-bonding electrons are paired with opposite spins. Therefore, total spin $S = (+1/2) + (-1/2) = 0$. Consequently, $M = 2(0) + 1 = 1$.