Hydrogen peroxide () possesses a unique non-planar "open-book" geometry. Which of the following accu — Hydrogen Chemistry Question

💡 Solution & Explanation

To minimize lone-pair repulsions, $H_2O_2$ opens to a dihedral angle of roughly $111.5^\circ$ in the unconstrained gas phase. In the solid phase, extensive intermolecular hydrogen bonding forces the molecule to compress, narrowing the dihedral angle to $90.2^\circ$.