Coordination Compounds 1 Question 2
####2. The species that can have a trans-isomer is (en = ethane -1 , 2-diamine, ox $=$ oxalate $)$
(a) $\left[Pt(en) Cl _2\right]$
(b) $\left[Cr(en) _2(ox)\right]^{+}$
(c) $\left[Pt(en) _2 Cl _2\right]^{2+}$
(d) $\left[Zn(en) Cl _2\right]$
(2019 Main, 10 April I)
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Answer:
Correct Answer: 2. (b)
Solution:
- Key Idea Square planar complexes of general formulae : $\left[M(a-a) b _2\right]$ and $[M(a-a)(b-b)]$ do not show geometrical isomerism. Whereas, an octahedral complex of general formula $\left[M(a-a) _2 b _2\right]$ can show geometrical (cis-trans) isomerism.
$\left[Pt(en) _2\left(Cl _2\right)\right]^{2+}$ with formula $\left[M(a-a) _2 b _2\right]$ will show geometrical isomerism as follows:
(I)
