Question

Which one of the following structures in Column I does not have the correct IUPAC name as given in Column II?

• A. B
• B. A
• C. D
• D. C

Hint:

When naming coordination compounds, remember to consider the ligands first (alphabetically), followed by the metal with its oxidation state. For complexes, remember to include the charge of the metal ion in the name.

Answer 1

The Correct Option is B

Step 1: Understand the IUPAC naming conventions.
In IUPAC nomenclature, the names of coordination compounds are based on the ligands, the metal ion, and its oxidation state. For example, the ligand \( \text{NH}_3 \) is named ammine, and \( \text{Cl} \) is named chloride. The metal’s oxidation state is determined and included in the name of the complex.

Step 2: Analyze the structure in option A.
For option A, the structure is \( [CoBr_2(en)]Cl \), which involves cobalt with two bromine ligands, ethylenediamine (en), and chloride as a counter ion. According to IUPAC, the name should be "dibromido(ethane-1, 2-diamine)cobalt(III) chloride", which is consistent with the given name P. Therefore, the name is correct for this structure.

Step 3: Analyze the structure in option B.
For option B, the structure is \( Na[PtBrCl(NO_2)(NH_3)] \). The name given in column II is "Sodium amminebromochlorodinitrito- N - palatinate(II)", but the IUPAC name for this structure is "Sodium bromochloroammine nitrito(N)-platinum(II)". The name in column II is incorrect. Thus, the answer to this question is option (B).

Step 4: Analyze the other options.
Option C and D are correctly named in IUPAC terms. Thus, they do not contain incorrect names.

Step 5: Conclusion.
The structure in option B does not have the correct IUPAC name, making the correct answer option (B).