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?

  • A M A B 3 3
  • B M A B 5
  • C M A 6

Q2:

Which of the following ligands cannot display linkage isomerism?

  • A C N
  • B S C N
  • C N H 3
  • D N O 2

Q3:

[ C o ( N H ) O N O ] C l ( ) 3 5 2 s can be prepared from [ C o ( N H ) N O ] C l ( ) 3 5 2 2 s by illumination with a tungsten filament. Which type of isomerism is demonstrated by this reaction?

Co 2 + N H 3 N H 3 N H 3 N N H 3 N H 3 O O Co 2 + N H 3 N H 3 N H 3 N H 3 O N H 3 N O
  • A Atropisomerism
  • B Chain isomerism
  • C E-Z isomerism
  • D Optical isomerism
  • E Linkage isomerism

Q4:

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

  • A [ P t ( e n ) C l ] C l 2 2 2
  • BSquare planar [ P t ( N H ) C l ] 3 3 +
  • C [ F e ( H O ) C l ] 2 3 3
  • D [ C o ( H O ) ] 2 6 2 +
  • ETetrahedral [ N i ( C O ) C l ] 2 2

Q5:

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

  • A [ P t ( N H ) C l ] 3 2 2
  • B [ F e ( C N ) C l ] 4 2
  • C [ P t ( e n ) C l ] C l 2 2 2
  • D [ F e ( H O ) C l ] 2 3 3
  • E Trigonal bipyramidal [ M n ( C O ) ( N O ) ] 3 2

Q6:

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

  • A M A B 2 2
  • B M B 4
  • C M A B 3
  • D M A 4
  • E M A B 3

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?

  • A M A B C 2
  • B M A B 3
  • C M A B C D
  • D M A B 2 2

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?

  • A M A 5
  • B M A B C 3
  • C M A B 4
  • D M A B 3 2
  • E M A B C 2 2

Q9:

Which geometry would you expect the [ P t ( C N ) ] 4 2 complex to have?

  • ATrigonal bipyramidal
  • BSeesaw
  • CSquare planar
  • DTetrahedral
  • ETetragonal

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