Find the number of complexes which shows geometrical isomerism as well as optical isomerism.
(i) $[Ni (en)_{3}]^{2 \oplus}$
(ii) $[PtCl_{2} (PPh_{3}) (NH_{3})]$
(iii) $[Fe (en)_{2} (CN)_{2}]^{\oplus}$
(iv) $[Co (ox) Cl_{2} F_{2}]^{3 -}$

Question

Find the number of complexes which shows geometrical isomerism as well as optical isomerism.

(i) $[Ni (en)_{3}]^{2 \oplus}$

(ii) $[PtCl_{2} (PPh_{3}) (NH_{3})]$

(iii) $[Fe (en)_{2} (CN)_{2}]^{\oplus}$

(iv) $[Co (ox) Cl_{2} F_{2}]^{3 -}$

TestHub · Accepted Answer

(i) [ N i ( e n ) 3 ​ ] ²⁺: Octahedral [ M ( AA ) 3 ​ ] type; shows only optical isomerism (OI) but no geometrical isomerism (GI). (ii) [ PtC l 2 ​ ( PP h 3 ​ ) ( N H 3 ​ )] : Square planar [ M A 2 ​ BC ] type; shows only GI (cis/trans) but no OI due to its flat molecular plane of symmetry. (iii) [ F e ( e n ) 2 ​ ( CN ) 2 ​ ] ⁺: Octahedral [ M ( AA ) 2 ​ B 2 ​ ] type; shows both GI and OI because its cis-isomer is chiral (lacks symmetry). (iv) [ C o ( o x ) C l 2 ​ F 2 ​ ] ³⁻: Octahedral [ M ( AA ) B 2 ​ C 2 ​ ] type; shows both GI and OI as its fully cis geometrical forms are optically active. Conclusion: Only 2 complexes ((iii) and (iv)) show both types of isomerism.

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