JEE Main · 2012 · 29 Apr 2012 · Offline · Coordination Compounds

Which among the following will be named as dibromidobis(ethylene diamine)chromium(III) bromide ?

(A) $[Cr (en)_{3}] Br_{3}$
(B) $[Cr (en)_{2} Br_{2}] Br$ ✓ Correct
(C) $[Cr (en) Br_{4}]^{-}$
(D) $[Cr (en) Br_{2}] Br$

Answer: (B)

Solution

Reading the name, "dibromido" places two bromide ligands inside the coordination sphere, "bis(ethylenediamine)" places two neutral en ligands there as well, and chromium is in the

+ 3

state; the single "bromide" at the end is a counter-ion outside the sphere. The complex cation is therefore

[Cr (en)_{2} B r_{2}]^{+}

balanced by one

B r^{-}

, written

[Cr (en)_{2} B r_{2}] Br

JEE Main · 2012 · 29 Apr 2012 · Offline · Single correct option

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