One of the skin-irritating components of poison oak is tetrahydrourushiol:
The long, nonpolar hydrocarbon tail embeds itself in a person's oily skin, where the molecule initiates an allergic response. Scratching the itch spreads tetrahydrourushiol molecules over a greater surface area, causing the zone of irritation to grow. Is this compound an alcohol or a phenol?
A. an alcohol because of the hydroxyl groups it contains
B. a phenol because of the hydroxyl groups attached to the benzene ring
C. both a phenol and an alcohol because of the hydroxyl groups it contains
D. neither an alcohol nor phenol because it contains two hydroxyl groups instead of one
Answer: B
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