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Coordination Compounds

Question

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Consider the following reaction and statements:
$[C o (N H_{3})_{4} B r_{2}]^{+} + B r^{-} \overset{}{\to} [C o (N H_{3})_{3} B r_{3}] + N H_{3}$
(I) Two isomers are produced if the reactant complex ion is a cis-isomer
(II) Two isomers are produced if the reactant complex ion is a trans-isomer
(III) Only one isomer is produced if the reactant complex ion is a trans-isomer
(IV) Only one isomer is produced if the reactant complex ion is a cis – isomer
The correct statements are

(II) and (IV)

(I) and (II)

(I) and (III)

(III) and (IV)

Solution

C.

(I) and (III)

Some More Questions From Coordination Compounds Chapter

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.

Predict the number of unpaired electrons in the square planar [Pt(CN)₄,]^2– ion.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

Calculate the overall complex dissociation equilibrium constant for the Cu(NH₃)₄²⁺ion, given β₄ for this complex is 2.1 x 10¹³.

Identify the ligands from the following coordination compounds:
(a)    [Co(en)₂Cl(NO₂)₂]
(b)    K[Co(CN)(CO₂)(NO)]
(c)    K₃[Al(OH)₆]
(d)    [Co(H₂O)₂(NH₃)₄](OH)₃

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