Benzenediols or dihydroxybenzenes are aromatic chemical compounds in which two hydroxyl groups are substituted onto a benzene ring. Because they have at least one hydroxyl group covalently bonded directly to a carbon atom in a benzene ring, they are in a class of organic compounds called phenols. There are three isomers of bezenediol, each of which has its own common or non-systematic name as shown in the mini-table below. Various other ways of naming these three chemical compounds are also shown: In chemistry, an aromatic molecule is one in which electrons are free to cycle around circular arrangements of atoms, which are alternately singly and doubly bonded to one another. ... ... Hydroxide is a functional group consisting of oxygen and hydrogen: -O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. ... Benzene, C6H6, PhH, or benzol is a colorless and flammable liquid with a pleasant, sweet smell. ... Covalently bonded hydrogen and carbon in a molecule of methane. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Properties For alternative meanings see atom (disambiguation). ... An organic compound is any member of a large class of chemical compounds whose molecules contain carbon, with exception of carbides, carbonates and carbon oxides. ... In organic chemistry, phenols, sometimes called phenolics, are a class of chemical compounds consisting of a hydroxyl group (-OH) attached to an aromatic hydrocarbon group. ... In chemistry, isomers are molecules with the same chemical formula and often with the same kinds of bonds between atoms, but in which the atoms are arranged differently. ...

All three of these compounds are colorless to white granular solids at room temperature and pressure, but upon exposure to oxygen they may darken. All three isomers have the chemical formula C₆H₆O₂. The chemical structures are shown here: Resorcin (or resorcinol) is the (1,3) isomer of dihydroxybenzene (dihydric phenol). ... A solid is a phase of matter, characterized by resistance to deformation and changes of volume. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... Pressure is the application of force to a surface, and the concentration of that force in a given area. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Chemical structure is the arrangement of atoms within a molecule, usually linked by covalent bonds. ...

Similar to other phenols, the hydroxyl groups on the aromatic ring of a benzenediol are weakly acidic. Each benzenediol can lose an H⁺ from one of the hydroxyls to form a monophenolate ion or lose an H⁺ from both to form a diphenolate ion. Wikipedia does not have an article with this exact name. ... For alternative meanings see acid (disambiguation). ...

Urushiols are naturally existing organic compounds which have the catechol skeleton structure and diphenol functionality but with alkyl groups substituted onto the aromatic ring. Urushiols are the skin-irritating poisons found in plants like poison ivy, etc. Two parts of a molecule of catechin, another natural compound which is used for tea, have the catechol skeleton structure in it. For specific information on prevention and treatment of urushiol poisoning, see Urushiol-induced contact dermatitis. ... An Alkyl is a univalent radical containing only carbon and hydrogen atoms arranged in a chain. ... The skull and crossbones symbol traditionally used to label a poisonous substance. ... Binomial name Toxicodendron radicans (L.) Kuntze Poison-ivy (Toxicodendron radicans or Rhus toxicodendron), in the family Anacardiaceae, is a woody vine that is well-known for its ability to produce urushiol, a skin irritant which for most people will cause an agonizing, itching rash. ... Catechin is a bioflavonoid and a powerful anti-oxidant. ...

Both hydroquinone and catechol have been used as film developing chemicals. The use of hydroquinone for film developing is common. A piece of photographic film that has been exposed to light in a controlled manner must be developed before it can be used. ...

Hydroquinone can undergo mild oxidation to convert to the compound parabenzoquinone, C₆H₄O₂, often called p-quinone or simply quinone. Reduction of quinone reverses this reaction back to hydroquinone. Some biochemical compounds in nature have this sort of hydroquinone or quinone section in their structures, such as Coenzyme Q, and can undergo similar redox interconversions. Hydroquinone has a variety of uses principally associated with its action as a reducing agent which is soluble in water. It is a major component in most photographic developers where, with the compound Metol, it reduces silver halides to elemental silver. Catechol has also been used as film developing chemical. The most fundamental reactions in chemistry are the redox processes. ... A quinone or benzoquinone is generally defined as an aromatic benzene molecule containing a double ketone functional group. ... Reduction or reducing has several meanings: In mathematics, reduction is the process of manipulating a series of equations or matrices into a desired simpler format. ... Coenzyme Q (CoQ), also known as ubiquinone or ubiquinol, is a biologically active quinone with an isoprenoid side chain, related in structure to vitamin K and vitamin E. // History Coenzyme Q was first discovered in 1957 by professor F. L. Crane and colleagues at the University of Wisconsin Enzyme Institute. ... Redox reactions include all chemical processes in which atoms have their oxidation number (oxidation state) changed. ... A substance is soluble in a fluid if it dissolves in the fluid. ... In film developing, photographic developer (or just developer) is a chemical that makes the image on the film or print visible. ... ... Halides are either a class of mineral whose principle anions are halogens or the ionic form of a halogen. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ...

In human medicine, hydroquinone also used as a topical application to reduce the color of skin. It does not have the same predisposition to cause dermatitis as Metol does. Dermatitis is a term literally meaning inflammation of the skin. It is usually used to refer to eczema, which is also known as Dermatitis eczema. ...