The Carbon Quandary: Essential and Detrimental - Sustainable Design: The Science of Sustainability and Green Engineering - page 264

Table 7.1 ( Continued )

Chemical Class Functional Group

1,4-Xylene or para- xylene ( p -xylene)

CH 3

CH 3

Hydroxyphenols (do not follow general nomenclature rules for substituted benzenes)
Catechol (1,2-hydroxiphenol)

OH

OH

Resorcinol (1,3-hydroxiphenol)

OH

OH

Hydroquinone (1,4-hydroxiphenol)

OH

OH

a The letter “X” commonly denotes a halogen (e.g., fluorine, chlorine, or bromine) in organic chemistry.
However, since this topic is an amalgam of many scientific and design disciplines, where x often means an
unknown variable and horizontal distance on coordinate grids, this rule is sometimes violated. Simply note
that when consulting manuals on the physicochemical properties of organic compounds, such as those for
pesticides and synthetic chemistry, the “X” usually denotes a halogen.