The IUPAC name of $[CoCl_2(en)_2]Cl$ is:
ADichlorobis(ethylenediamine)cobalt(III) chloride
BBis(ethylenediamine)dichlorocobalt(III) chloride
CBis(ethane-1,2-diamine)dichlorocobalt(II) chloride
DBoth A and B refer to the same compound — A is the strict alphabetical IUPAC form
Answer & Solution
Correct answer: A. Dichlorobis(ethylenediamine)cobalt(III) chloride
Alphabetise ignoring multiplying prefixes (bis, di): 'chloro' (c) before 'ethylenediamine' (e). So 'dichlorobis(ethylenediamine)' is the correct ordering. Charge: complex must be +1 (to balance external Cl⁻); 2(-1) + 2(0) + Co = +1 ⇒ Co = +3.
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