Dichlorine monoxide

Dichlorine monoxide (Cl₂O) is a yellow-brown, reactive gas that acts as a chlorinating and oxidizing agent. It can be prepared by reacting chlorine with mercury(II) oxide.

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Molecular geometry: The three-dimensional arrangement of atoms in a molecule. Cl₂O has a bent Cl–O–Cl structure, which shapes its polarity and reactivity.
Chlorine: A halogen element with symbol Cl and atomic number 17. Cl₂O is a binary compound of chlorine and oxygen, and chlorine supplies its reactive atoms.
Mercury(II) oxide: An inorganic compound with formula HgO, occurring as red or yellow solids. HgO reacts with chlorine to produce dichlorine monoxide while binding oxygen from the oxide.
Organic chlorination: The introduction of chlorine into organic molecules through chemical reactions. Dichlorine monoxide can supply electrophilic chlorine for selected organic transformations.
Oxidation state: A formal measure of electron ownership assigned to atoms in compounds. The oxidation-state assignments clarify how chlorine changes during Cl₂O reactions.
Chlorine oxides: Compounds containing chlorine and oxygen, often unstable and strongly oxidizing. Dichlorine monoxide is a member of this reactive compound family.
Chemical synthesis: The deliberate production of chemical compounds through controlled reactions. The HgO route is a preparation method for this otherwise unstable chlorine oxide.
Oxidation: A chemical process involving electron loss or an increase in oxidation state. Cl₂O acts as an oxidant in reactions where substrates are converted to more oxidized products.
Hydrolysis: A chemical reaction in which water breaks or transforms chemical bonds. Water converts Cl₂O into hypochlorous acid, linking the oxide to aqueous chlorine chemistry.
Dichlorine hexoxide: A chlorine oxide with formula Cl₂O₆, containing chlorine in higher oxidation states than Cl₂O. It is a distinct, higher oxide that illustrates the range of chlorine–oxygen compounds.