Hydroquinone

Hydroquinone
Names
	Preferred IUPAC name Benzene-1,4-diol
	Other names Hydroquinone; Idrochinone; Quinol; 1,4-Dihydroxybenzene; p-dihydroxybenzene; p-hydroxyphenol; 1,4-Hydroxy benzene
Identifiers
CAS Number	123-31-9 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	605970
ChEBI	CHEBI:17594 ;
ChEMBL	ChEMBL537 ;
ChemSpider	764 ;
DrugBank	DB09526;
ECHA InfoCard	100.004.199
EC Number	204-617-8;
Gmelin Reference	2742
KEGG	D00073 ;
PubChem CID	785;
RTECS number	MX3500000;
UNII	XV74C1N1AE ;
UN number	3077, 2662
CompTox Dashboard (EPA)	DTXSID7020716 ;
	InChI InChI=1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H Key: QIGBRXMKCJKVMJ-UHFFFAOYSA-N ; InChI=1/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H Key: QIGBRXMKCJKVMJ-UHFFFAOYAX;
	SMILES c1cc(ccc1O)O;
Properties
Chemical formula	C6H6O2
Molar mass	110.112 g·mol−1
Appearance	White solid
Density	1.3 g cm−3, solid
Melting point	172 °C (342 °F; 445 K)
Boiling point	287 °C (549 °F; 560 K)
Solubility in water	5.9 g/100 mL (15 °C)
Vapor pressure	10−5 mmHg (20 °C)
Acidity (pKa)	9.9
Magnetic susceptibility (χ)	−64.63×10−6 cm3/mol
Structure
Dipole moment	1.4±0.1 D
Pharmacology
ATC code	D11AX11 (WHO)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H317, H318, H341, H351, H400
Precautionary statements	P201, P202, P261, P264, P270, P272, P273, P280, P281, P301+P312, P302+P352, P305+P351+P338, P308+P313, P310, P321, P330, P333+P313, P363, P391, P405, P501
NFPA 704 (fire diamond)	2 1
Flash point	165 °C (329 °F; 438 K)
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	490 mg/kg (mammal, oral); 245 mg/kg (mouse, oral); 200 mg/kg (rabbit, oral); 320 mg/kg (rat, oral); 550 mg/kg (guinea pig, oral); 200 mg/kg (dog, oral); 70 mg/kg (cat, oral)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 2 mg/m3
REL (Recommended)	C 2 mg/m3 [15-minute]
IDLH (Immediate danger)	50 mg/m3
Related compounds
Related benzenediols	Pyrocatechol; Resorcinol
Related compounds	1,4-benzoquinone
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Hydroquinone, also known as benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C₆H₄(OH)₂. It has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also referred to as hydroquinones. The name "hydroquinone" was coined by Friedrich Wöhler in 1843.

In 2021, it was the 282nd most commonly prescribed medication in the United States, with more than 800,000 prescriptions.

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