The number of chlorine atoms in bithionol is ____.
Answer: 4
Solution
Bithionol (also spelled bithionol) is a halogenated phenolic compound used as an antiseptic. Its IUPAC name is 2,2'-thiobis(4,6-dichlorophenol).
The structure shows two phenol rings connected by a sulfur bridge, with each ring bearing two chlorine substituents (at positions 4 and 6 relative to the OH group).
Total chlorine atoms = 2 (on first ring) + 2 (on second ring) = 4.