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  • The IUPAC name for the complex <img alt="\mathrm{ \left [ Co(NO_{2})(NH_{3})_{5} \right ]Cl_{2}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B%20%5Cleft%20%5B%20Co%28NO_%7B2%7D

The IUPAC name for the complex \mathrm{ \left [ Co(NO_{2})(NH_{3})_{5} \right ]Cl_{2}}  is

Option: 1

nitrito­-N-­pentaamminecobalt (III) chloride


Option: 2

nitrito-­N­-pentaamminecobalt (II) chloride


Option: 3

pentaammine nitrito­-N­-cobalt (II) chloride


Option: 4

pentaammine nitrito-­N-cobalt (III) chloride.


Answers (1)

best_answer

As we discussed in the concept

Writing the name of Complex compound formula -

(i) Cation is named first 

(ii) ligands are named in alphabetical order before name of central metal atom.

(iii) Prefixes, mono, di, tri are used to indicate the no of ligands

(iv) when name of ligand used a numerical prefix, then term bis, tris, tetrakis are used.

(v) Oxidation state is represented by roman numerical in parenthesis

(vi) If the complex ion is an anion, the name of metal ends with suffix -ate

Oxidation state:

\\\mathrm{\left [ Co(NO_2)(NH_3)_5 \right ]^{2+}+2Cl^- }

So, charge on coordination sphere is 2+

Now,

\\X_{(Co)} + (-1) + 5(0) = +2\\ \\X_{(Co)} = +3

Oxidation state of Co = +3

So,

The name of \mathrm{\left [ Co(NO_2)(NH_3)_5 \right ]Cl_2 } is Pentaammine nitrito-­N-cobalt (III) chloride.

Therefore, option (4) is correct.

Posted by

Ritika Kankaria

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