Worksheet: Molecular Orbital Geometries

In this worksheet, we will practice using the drawings of molecular orbitals to explain the geometries and reactivities of organic molecules and metal complexes.

Q1:

If M is a metal and A and B are different ligands, which of the following octahedral complexes can exhibit geometric isomerism?

  • AMAB33
  • BMA6
  • CMAB5

Q2:

Which of the following ligands cannot display linkage isomerism?

  • ANH3
  • BCN
  • CSCN
  • DNO2

Q3:

[Co(NH)ONO]Cl()352s can be prepared from [Co(NH)NO]Cl()3522s by illumination with a tungsten filament. Which type of isomerism is demonstrated by this reaction?

Co2+NH3NH3NH3NNH3NH3OOCo2+NH3NH3NH3NH3ONH3NO
  • ALinkage isomerism
  • BE-Z isomerism
  • CAtropisomerism
  • DChain isomerism
  • EOptical isomerism

Q4:

Which of the following complexes exhibits cis-trans or optical isomerism?

  • A[Pt(en)Cl]Cl222
  • B[Fe(HO)Cl]233
  • C[Co(HO)]262+
  • DTetrahedral [Ni(CO)Cl]22
  • ESquare planar [Pt(NH)Cl]33+

Q5:

In which of the following compounds are fac and mer isomers of the transition metal complex possible?

  • ATrigonal bipyramidal [Mn(CO)(NO)]32
  • B[Fe(HO)Cl]233
  • C[Fe(CN)Cl]42
  • D[Pt(NH)Cl]322
  • E[Pt(en)Cl]Cl222

Q6:

If M is a metal and A and B are different ligands, which of the following square planar complexes can exhibit geometric isomerism?

  • AMB4
  • BMAB22
  • CMA4
  • DMAB3
  • EMAB3

Q7:

If M is a metal and A, B, C, and D are different ligands, which of the following square planar complexes does not exhibit geometric isomerism?

  • AMAB22
  • BMABC2
  • CMABCD
  • DMAB3

Q8:

If M is a metal and A, B, and C are different ligands, which of the following trigonal bipyramidal complexes displays exactly four geometric isomers?

  • AMABC3
  • BMABC22
  • CMA5
  • DMAB32
  • EMAB4

Q9:

Which geometry would you expect the [Pt(CN)]42 complex to have?

  • ATetrahedral
  • BTrigonal bipyramidal
  • CSeesaw
  • DSquare planar
  • ETetragonal

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