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Oxidation of Alcohols

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find the total number of enantiomers of \lbrack M(en)_2ab\rbrack complex where M is the central metal atom and a,b are ligands. (en) represents ethylene 1,2 diamine. _{}

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Q. Assertion :A stable complex is formed when ethylene diamine (en) is added to

[N i (H_{2} O)_{4}]^{2 +}

. Reason: (en) being a strong ligand replaces weak ligand

H_{2} O

and thus, chelate is formed.

Q. The coordination number and the oxidation state of the element

E

' in the complex

[E (e n)_{2} (C_{2} O_{4})] N O_{2}

(where (en) is ethylene diamine) are respectively:

Q. The co-ordination number and the oxidation state of the element 'M' in the complex

[M (e n)_{2} (C_{2} O_{4})] N O_{2}

{

where (en) ethane -

1, 2

}

are respectively.

Q. In an aqueous solution of

N i C l_{2}

, if the bidentate ligand ethylene - 1, 2 - diamine (en) is added progressively in molar ratios such as Ni ∶ en - 1 ∶ 1, 1 ∶ 2, 1 ∶ 3 then three octahedron complexes x, y and z are formed respectively. Select the correct statement(s) about x, y and z.

Q. The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of

C o C l_{3} .4 N H_{3}

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