Which of the following molecules do NOT undergo central-atom hybridization, retaining bond angles cl — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Drago's Rule asserts that elements in the 3rd period and below (like P, S, As) do not undergo hybridization when bonded to significantly less electronegative atoms like Hydrogen. They utilize pure orthogonal p-orbitals ($p_x, p_y, p_z$) for bonding, resulting in bond angles near $90^\circ$. $NH_3$ (2nd period N) undergoes standard $sp^3$ hybridization.