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Possible Answers:
PEEK.
Last seen on: USA Today Crossword Answers – Jan 12 2023
Random information on the term “PEEK”:
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.
Hydroquinone is produced industrially in two main ways.
Other, less common methods include:
The reactivity of hydroquinone’s hydroxyl groups resembles that of other phenols, being weakly acidic. The resulting conjugate base undergoes easy O-alkylation to give mono- and diethers. Similarly, hydroquinone is highly susceptible to ring substitution by Friedel–Crafts reactions such as alkylation. This reaction is exploited en route to popular antioxidants such as 2-tert-butyl-4-methoxyphenol (BHA). The useful dye quinizarin is produced by diacylation of hydroquinone with phthalic anhydride.