First slide

IUPAC Nomenclature

Question

Which among the following will be named as dibromidobis- (ethylenediamine) chromium (III) bromide?

Easy

A

$[Cr {(en)}_{3}] {Br}_{3}$
B

$[Cr {(en)}_{2} {Br}_{2}] Br$
C

${[Cr (en) {Br}_{4}]}^{-}$
D

$[Cr (en) {Br}_{2}] Br$

Solution

Two Br, two (en) and one Cr are parts of complex. Charge on the complex is
$\begin{array}{l} 2 (Br) = - 2 \\ 2 (en) = 0 \\ 1 (Cr) = + 3 \end{array}\} = + 1$
Thus, complex ion is [Cr(en)₂Br₂]⁺.
Since, anion is bromide thus, complex is [Cr(en)₂ Br₂]Br.

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