Question:
Which of the following exhibit only geometrical isomerism?
Which of the following exhibit only geometrical isomerism?
Show Hint
Complexes of type \(MA_3B_3\) show fac-mer geometrical isomerism.
Updated On: Jun 9, 2026
- Diaquadioxalatochromate (III) ion
- Dichloridobis(ethane - 1,2-diamine)platinum (IV) ion
- Triamminetrinitrito - N cobalt (III)
- Tris(ethane-1,2-diamine) cobalt (III) ion
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The Correct Option is C
Solution and Explanation
Concept:
Geometrical isomerism occurs in coordination compounds due to different spatial arrangements of ligands (cis/trans or fac/mer). Optical isomerism arises when a complex is chiral.
Step 1: Analyze each complex.
(A) \([Cr(H_2O)_2(C_2O_4)_2]^-\): shows both geometrical and optical isomerism.
(B) \([Pt(en)_2Cl_2]^{2+}\): shows both geometrical and optical isomerism.
(C) \([Co(NH_3)_3(NO_2)_3]\): shows only geometrical isomerism (fac and mer forms).
(D) \([Co(en)_3]^{3+}\): shows only optical isomerism.
Step 2: Conclusion.
Only \([Co(NH_3)_3(NO_2)_3]\) exhibits geometrical isomerism without optical isomerism. \[ \boxed{\text{Triamminetrinitrito - N cobalt (III)}} \]
Step 1: Analyze each complex.
(A) \([Cr(H_2O)_2(C_2O_4)_2]^-\): shows both geometrical and optical isomerism.
(B) \([Pt(en)_2Cl_2]^{2+}\): shows both geometrical and optical isomerism.
(C) \([Co(NH_3)_3(NO_2)_3]\): shows only geometrical isomerism (fac and mer forms).
(D) \([Co(en)_3]^{3+}\): shows only optical isomerism.
Step 2: Conclusion.
Only \([Co(NH_3)_3(NO_2)_3]\) exhibits geometrical isomerism without optical isomerism. \[ \boxed{\text{Triamminetrinitrito - N cobalt (III)}} \]
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