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Question

Which of the following compounds have been named correctly according to IUPAC rules:
(a)[Cr(NH3)5CO3]Cl - Pentamminecarbonatochromium (III) chloride
(b)[Co(NH3)5ONO]Cl2 - Pentammine-O-nitritocobalt (III) chloride
(c)K3[Cr(CN)6] - Potassium hexacyanochromate(III)
(d)[Co(NH3)6]Cl3 - Hexamminecobalt (III) chloride

A
a and b
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B
only c
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C
a, b and c
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D
all of the above
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Solution

The correct option is B all of the above
The compounds a, b,c and d have been named correctly according to IUPAC rules:
(a)[Cr(NH3)5CO3]Cl - Pentamminecarbonatochromium (III)
CO23 is named as carbonato and not as carbonate.
There are 5 ammonia ligands and one carbonate ligand. They are named in alphabetical order.
The prefix penta is used to name 5 ammonia ligands.
The oxidation state of Cr is written in parenthesis in roman numerals.
(b)[Co(NH3)5ONO]Cl2 - Pentammine-O-nitritocobalt (III) chloride;
There are 5 ammonia ligands and one nitrito ligand. They are named in alphabetical order.
The prefix penta is used to name 5 ammonia ligands.
The oxidation state of Co is written in parenthesis in roman numerals.
(c)K3[Cr(CN)6] - Potassium hexacyanochromate(III)
There are 6 cyano ligands.
The prefix six is used to name 6 cyano ligands.
The oxidation state of Cr is written in parenthesis in roman numerals.
(d)[Co(NH3)6]Cl3 - Hexamminecobalt (III) chloride
There are 6 ammonia ligands.
The prefix six is used to name 6 ammonia ligands.
The oxidation state of Co is written in parenthesis in roman numerals.

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