IIT-JEE 2012 · Paper 1 · Chemistry Q30

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ChemistrySingle correct+3 / -1Question 30 of 60

As per IUPAC nomenclature, the name of the complex $\ce{[Co(H2O)4(NH3)2]Cl3}$ is

Tetraaquadiaminecobalt (III) chloride

Tetraaquadiamminecobalt (III) chloride

Diaminetetraaquacobalt (III) chloride

Diamminetetraaquacobalt (III) chloride

Answer and worked solution

Official answer: D

Rules. Ligands are named in alphabetical order of the ligand name, ignoring multiplying prefixes; $\ce{NH3}$ is "ammine" (double m) and $\ce{H2O}$ is "aqua".

"ammine" comes before "aqua", so the cation is diamminetetraaquacobalt(III), and the compound is diamminetetraaquacobalt(III) chloride.

(D)

Topics:Nomenclature

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IIT-JEE 2012 · Paper 1, Chemistry question 30