JEE Advanced 2023 Paper 2 Q05 Chemistry Coordination Chemistry Nomenclature & Isomerism Medium

JEE Advanced 2023 Paper 2 · Q05 · Nomenclature & Isomerism

The complex(es), which can exhibit the type of isomerism shown by $[Pt(NH_3)_2 Br_2]$, is(are) [en = $H_2NCH_2CH_2NH_2$]

  1. A. $[Pt(en)(SCN)_2]$
  2. B. $[Zn(NH_3)_2 Cl_2]$
  3. C. $[Pt(NH_3)_2 Cl_4]$
  4. D. $[Cr(en)_2 (H_2O)(SO_4)]^+$
JEE Advanced multi-correct — pick every correct option, then check.
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Correct answer:C, D

Solution

$[Pt(NH_3)_2 Br_2]$ is square planar (Pt(II), $d^8$) and exhibits cis-trans (geometrical) isomerism. (A) $[Pt(en)(SCN)_2]$: en is bidentate, only one geometry possible — no geometrical isomerism. (B) $[Zn(NH_3)_2Cl_2]$ is tetrahedral — no cis/trans. (C) $[Pt(NH_3)_2Cl_4]$ is octahedral $Ma_2 b_4$ — exhibits cis/trans. (D) $[Cr(en)_2(H_2O)(SO_4)]^+$ is octahedral $M(AA)_2 ab$ — exhibits cis/trans. So (C) and (D).

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