The compound that cannot be kept in a glass vessel because it reacts with glass is:

Hydrofluoric acid ($\text{HF}$) aggressively attacks glass because it reacts with the silicon dioxide (${\text{SiO}}_2$) present in glass to form water-soluble complex compounds like sodium fluorosilicates or silicon tetrafluoride gas (${\text{SiF}}_4$). Because of this property, it is stored in plastic (polyethylene) vessels instead of glass containers.