CBSE 2025, Set 2

Question

Write IUPAC names of the following coordination entities:

(a) $[	ext{Fe(en)}_2	ext{Cl}_2]^+$

(b) $[	ext{Co(NH}_3)_4(	ext{H}_2	ext{O})	ext{Br}]	ext{SO}_4$

(c) $[	ext{Ni(CN)}_4]^{2-}$

Edvaya · Accepted Answer

The correct answer is Subjective. **(a) $[	ext{Fe(en)}_2	ext{Cl}_2]^+$:** - Ligands: 2 × ethane-1,2-diamine (en, bidentate) + 2 × chlorido - Oxidation state of Fe: $x + 0(2) + (-1)(2) = +1 \Rightarrow x = +3$ - Alphabetical order: chlorido (C) < ethane-1,2-diamine (E) **IUPAC name: Dichloridibis(ethane-1,2-diamine)iron(III) ion** **(b) $[	ext{Co(NH}_3)_4(	ext{H}_2	ext{O})	ext{Br}]	ext{SO}_4$:** - Ligands: 4 × ammine + 1 × aqua + 1 × bromido - Oxidation state of Co: $x + 0 + 0 + (-1) = +2$ (complex cation, SO₄²⁻ outside) $\Rightarrow x = +3$ - Alphabetical order: ammine (A), aqua (A-q), bromido (B) **IUPAC name: Tetraammineaquabromidocobalt(III) sulphate** **(c) $[	ext{Ni(CN)}_4]^{2-}$:** - Ligands: 4 × cyanido - Oxidation state of Ni: $x + (-1)(4) = -2 \Rightarrow x = +2$ - Anionic complex → suffix "-ate" **IUPAC name: Tetracyanidonickelate(II) ion**

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Chemistry > Inorganic Chemistry > Coordination Compounds

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