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Q. 104.1( 12 Votes )

Write IUPAC name of the complex [Cr(NH₃)₄Cl₂]⁺. Draw structures of geometrical isomers for this complex.
Tetraaminedichlorochromium(iii)

OR

Using IUPAC norms write the formulae for the following :

(i) Pentaamminenitrito-O-cobalt(III) chloride structure

(ii) Potassium tetracyanidonickelate(II)

Class 12th Chemistry - Board Papers All India - 2019 BVM-1

Answer :

IUPAC name of the complex [Cr(NH₃)₄Cl₂]⁺ is Tetraaminedichlorochromium(iii).
In the above compound, NH₃ ligand and Cl₂ are present as ligand and there are 4 NH₃ ligands are present and 2 Chlorine ligands are present so the prefix will be Tetra amine for the amine group and dichloro for the chlorine group and Cr acts as the central atom. So, it will be in the suffix.
The overall charge on Cr = +3
(O. No. of Cr is x, O. No. of Chlorine is -1 and the charge on while sphere is +1,
So, x-2 = +1, x= +3).
Thus, the IUPAC name of the given compound is Tetraaminedichlorochromium(iii).

Two geometrical isomers exist for this complex, these are trans-isomer and cis-isomer

OR

(i) [Co(NH₃)₅ONO]Cl_2,

Here, Cobalt will act as central atom whereas other ions NH₃, ONO will act as ligand.

(ii) K₂[Ni(CN)₄],

Here, Ni will act as central atom whereas CN^- ion will act as ligand.

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