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Which of the following is the chemical identity of the antiseptic chloroxylenol?

1. 4-chloro-3,5-dimethylphenol
2. 3-chloro-4,5-dimethylphenol
3. 4-chloro-2,5-dimethylphenol
4. 5-chloro-3,4-dimethylphenol

Correct answer: 4-chloro-3,5-dimethylphenol

Solution

Chloroxylenol (the active antiseptic in Dettol) is 4-chloro-3,5-dimethylphenol: a phenol with two methyl groups at the 3,5 positions and chlorine para (position 4) to the OH.

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