Which of the following chemical formulas corresponds to the IUPAC name 'dibromidobis(ethylenediamine — Coordination Compounds Chemistry Question

💡 Solution & Explanation

1. The complex cation has the ligands 'dibromido' ($2$ $Br^-$) and 'bis(ethylenediamine)' ($2$ $en$). 2. The central metal is chromium with an oxidation state of $+3$. 3. The cation formula is $[Cr(en)_2Br_2]^{n+}$. To find the charge $n$: $n = +3 (\text{from } Cr) + 2(0) (\text{from } en) + 2(-1) (\text{from } Br) = +1$. 4. To balance the $+1$ charge, exactly one bromide ($Br^-$) counter ion is needed outside the sphere. 5. The complete formula is $[Cr(en)_2Br_2]Br$.