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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
Identify the optically active compounds from the following:
$a. {\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}} $
$b.$ Trans $-\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+} $
$c.$ Cis $-\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+} $
$d.  {\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]} $
  • A
    $a$ and $b$
  • ✓
    $a$ and $c$
  • C
    $b$ and $c$
  • D
    $a$ and $d$
✓

Answer

Correct option: B.
$a$ and $c$
$(a, c) [\mathrm{Co}(\mathrm{en}) 3]^{3+}$ and cis $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{2+}$ are optically active compounds because their mirror images are non$-$superimposable isomer.

Non$-$supermposable isomers of $[\mathrm{Co}(\mathrm{en}) 3]^{3+}$

Non$-$superimosable isomers of $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
Hence$, (a)$ and $(c)$ are correct choices.

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