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Coordination Compounds
Question
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Which of the following complexes exhibits the highest paramagnetic behaviour?

Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities

(At. no. ; Ti = 22, V = 23, Fe =26, Co = 27)

  • [V(gly)2 (OH)2 (NH3)2]+

  • [Fe(en)(bpy)(NH3)2]+

  • [CO(OX)2(OH)2]-

  • [Ti(NH3)6]3+

Answer

C.

[CO(OX)2(OH)2]-

Greater is the number of unpaired electrons, larger is the paramagnetism.
[V(gly)2(OH)2(NH3)2]+
V23 = [Ar] 4s2, 3d2
Oxidation state of V in [[V(gly)2(OH)2(NH3)2]+ is
x + (-1) x 2 + (-1) x 2 + (0) x 2 = +1
x=+5
V5+ = [Ar]3d0
[Fe(en)(bby)(NH3)2]2+
x + (0) + (0) + (0) x 2 = +2
x = +2

Fe2+ = [Ar] 3d6
But en , bby and NH3 all are strong field ligands, so pairing occurs, thus no unpaired electrons.
[Co(OX)2 (OH)2]- is 
Oxidation state of Co in [Co(OX)2(OH)2]- is 
x + (-2) x 2 + (-1) x 2 = -1
x-6 = -1
x = +5
Co5+ = [Ar]3d4
[Ti(NH3)6]3+ is +3, thus it contains 1 unpaired electron.
Hence, [Co(OX)2(OH)2]- has highest paramagnetic behaviour.

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Some More Questions From Coordination Compounds Chapter

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Potassium tetracyanidonickelate(II)

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Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH3)6]Cl3
(ii) [Co(NH3)5Cl]Cl2
(iii) K3[Fe(CN)6]
(iv) K3[Fe(C2O4)3]
(v) K2[PdCl4]
(vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i)    K[Cr(H2O)2(C2O4)2],                      (ii) [Co(en)3Cl3,
(iii) [Co(NH3)5(NO2)]|NO3]2,                 (iv) [Pt(NH3)(H2O)Cl2]

Explain on the basis of valence bond theory that [Ni(CN)4]2–  ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.