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JEE Main levelSingle correct optionDifficulty 2 of 3cc096

The correct IUPAC name of $[Co (en) X_{2} Cl X_{2}] Cl$ (en = ethane-1,2-diamine) is

Adichloridodi(ethane-1,2-diamine)cobalt(III) chloride
Bdichloridobis(ethane-1,2-diamine)cobalt(II) chloride
Cdichloridobis(ethane-1,2-diamine)cobalt(III) chloride
Dbis(ethane-1,2-diamine)dichloridocobalt(III) chloride

Answer: C

The cation is

+ 1

, so

x + 0 - 2 = + 1

and Co is +3. Alphabetical order ignores di/bis: chlorido (c) comes before ethane-1,2-diamine (e). A ligand name that contains locants takes bis, not di.

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