4-Hydroxybenzaldehyde

4-Hydroxybenzaldehyde
Names
	Preferred IUPAC name 4-Hydroxybenzaldehyde
	Other names p-Hydroxybenzaldehyde, 4-formylphenol
Identifiers
CAS Number	123-08-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:17597 ;
ChEMBL	ChEMBL14193 ;
ChemSpider	123 ;
DrugBank	DB03560 ;
ECHA InfoCard	100.004.182
KEGG	C00633 ;
PubChem CID	126;
UNII	O1738X3Y38 ;
CompTox Dashboard (EPA)	DTXSID8059552 ;
	InChI InChI=1S/C7H6O2/c8-5-6-1-3-7(9)4-2-6/h1-5,9H Key: RGHHSNMVTDWUBI-UHFFFAOYSA-N ; InChI=1/C7H6O2/c8-5-6-1-3-7(9)4-2-6/h1-5,9H Key: RGHHSNMVTDWUBI-UHFFFAOYAN;
	SMILES O=Cc1ccc(O)cc1;
Properties
Chemical formula	C7H6O2
Molar mass	122.123 g·mol−1
Appearance	yellow to tan powder
Density	1.129 g/cm3 (130 °C)
Melting point	116 °C (241 °F; 389 K)
Boiling point	310 to 311 °C (590 to 592 °F; 583 to 584 K)
Solubility in water	12.9 g/L
Acidity (pKa)	7.61 (25 °C)
Magnetic susceptibility (χ)	−78.0·10−6 cm3/mol
Refractive index (nD)	1.57051 (130 °C)
	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

4‑Hydroxybenzaldehyde (para‑hydroxybenzaldehyde) is an organic compound with the formula C₆H₄OH(CHO). Along with 2-hydroxybenzaldehyde and 3-hydroxybenzaldehyde, it is one of the three isomers of hydroxybenzaldehyde.