The IUPAC name for the complex [Co(NH_3)_5 (NO_2)]Cl_2 is - Vidyadip

MCQ

The $IUPAC$ name for the complex $[Co(NH_3)_5 (NO_2)]Cl_2$ is

A
Nitrito $-N-$ pentaammine cobalt $(III)$ chloride
B
Nitrito $-N-$ pentaammine cobalt $(II)$ chloride
C
Pentaammine nitrito $-N-$ cobalt $(II)$ chloride
✓
Pentaammine nitrito $-N-$ cobalt $(III)$ chloride

✓

Answer

Correct option: D.

Pentaammine nitrito $-N-$ cobalt $(III)$ chloride

d
$E A N=Z-X+Y$

$Z =$ Atomic number of the metal

$X =$ Number of electrons lost during the formation of the metal ion from its atom Y=Number of electrons donated by the ligands

For $\left[N i(C O)_{4}\right]$

$E A N=Z-X+Y=28-0+8=36$

For $\left[N i(C N)_{4}\right]^{2-}=28-2+8=34$

Thus the EAN of $\left[N i(C O)_{4}\right]$ and $\left[N i(C N)_{4}\right]^{2-}$ is not the same.

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