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What is the correct IUPAC name of the complex [Hg(CHCl2)(C6H5)] (mercury complex with dichloromethyl and phenyl groups)?
- Dichloromethylbenzylmercury(II)
- Benzyldichloromethylmercury(II)
- Chloroformphenylmercury(II)
- (Dichloromethyl)(phenyl)mercury
Correct answer: (Dichloromethyl)(phenyl)mercury
Solution
[Hg(CHCl2)(Ph)] is an organomercury(II) compound with a dichloromethyl (CHCl2) ligand and a phenyl (C6H5) ligand. IUPAC names organic ligands alphabetically as substituents before the metal. 'Dichloromethyl' (d) comes before 'phenyl' (p). The correct IUPAC name is (dichloromethyl)(phenyl)mercury. None of the first three given options are strictly IUPAC: 'benzyl' is wrong (benzyl = C6H5CH2-, not C6H5-), and 'chloroform' is CHCl3 not CHCl2.
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