IIT-JEE 2009 · Paper 1 · Chemistry Q10

ChemistryMultiple correct+4 / -1Question 10 of 60

The compound(s) that exhibit(s) geometrical isomerism is(are)

\ce{[Pt(en)Cl2]}

\ce{[Pt(en)2]Cl2}

\ce{[Pt(en)2Cl2]Cl2}

\ce{[Pt(NH3)2Cl2]}

Answer and worked solution

Official answer: C, D

(A) $\ce{[Pt(en)Cl2]}$ : square planar; the chelating en must span two cis positions, so only one arrangement exists.
(B) $\ce{[Pt(en)2]^{2+}}$ : square planar with two chelates; no isomers.
(C) $\ce{[Pt(en)2Cl2]^{2+}}$ : octahedral $\ce{M(AA)2B2}$ ; the two Cl can be cis or trans. Shows geometrical isomerism.
(D) $\ce{[Pt(NH3)2Cl2]}$ : square planar $\ce{MA2B2}$ , cis and trans (cisplatin).

(C), (D)

Topics:Isomerism in complexes

IIT-JEE 2009 · Paper 1, Chemistry question 10