Ethane-1,2-diol (Ethylene glycol) undergoes various specific dehydration reactions depending strictl — Alcohols Phenols and Ethers Chemistry Question

💡 Solution & Explanation

Ethylene glycol forms 1,4-dioxane with conc. $H_2SO_4$, undergoes rearrangement to ethanal with anhydrous $ZnCl_2$, and forms the cyclic ether oxirane upon high-temperature heating ($500^\circ\text{C}$). Dilute $HNO_3$ is an oxidizing agent, not a standard dehydrating agent for this conversion.