Coordination Compounds 1 Question 2

####2. The species that can have a trans-isomer is (en = ethane -1 , 2-diamine, ox = oxalate )

(a) [Pt(en)Cl2]

(b) [Cr(en)2(ox)]+

(c) [Pt(en)2Cl2]2+

(d) [Zn(en)Cl2]

(2019 Main, 10 April I)

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Answer:

Correct Answer: 2. (b)

Solution:

  1. Key Idea Square planar complexes of general formulae : [M(aa)b2] and [M(aa)(bb)] do not show geometrical isomerism. Whereas, an octahedral complex of general formula [M(aa)2b2] can show geometrical (cis-trans) isomerism.

[Pt(en)2(Cl2)]2+ with formula [M(aa)2b2] will show geometrical isomerism as follows: (I)



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