Question

The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl₂ is ______.

Options

• nitrito-N-pentaaminecobalt (III) chloride

• nitrito-N-pentaamminecobalt (II) chloride

• pentaamminenitrito-N-cobalt (II) chloride

• pentaamminenitrito-N-cobalt (III) chloride

Answer 1

The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl₂ is pentaamminenitrito-N-cobalt (III) chloride.

Explanation:

• NH₃ is called ammine.
• NO₂ is a nitrito-N ligand (attached through nitrogen).
• The cobalt has a +3 charge, so it is cobalt(III).
• There are two chloride ions as counterions.

Thus, the name is pentaamminenitrito-N-cobalt (III) chloride.