QUESTION 30 An advantage of MO theory over Lewis structures is that it explains

Question

QUESTION 30

An advantage of MO theory over Lewis structures is that it

explains the phenomenon of resonance.

all of the possible answer choices are correct

shows how atoms are connected to one another.

explains the magnetic properties of molecules.

3 points   

QUESTION 31

What does molecular orbital theory have in common with valence bond theory?

antibonding orbitals

hybrid atomic orbitals

and bonds

all of the possible answer choices are correct

3 points   

QUESTION 32

What is one advantage of molecular orbital theory over valence bond theory?

It explains and gives a picture of molecular geometry.

all of the possible answer choices are correct

It explains and gives a picture of double bonds.

It works well with molecules having an odd number of electrons.

3 points   

QUESTION 33

What is one advantage of valence bond theory over molecular orbital theory?

all of the possible answer choices are correct

It explains and gives a picture of double bonds.

It works well with molecules having an odd number of electrons.

It explains and gives a picture of molecular geometry.

explains the phenomenon of resonance.

all of the possible answer choices are correct

shows how atoms are connected to one another.

explains the magnetic properties of molecules.

Explanation / Answer

30. MO theory doesn’t need resonance structures to describe the shapes of molecules. Both MO theory and Lewis theory show the connectivity of atoms. However, MO theory show shows the arrangement of electrons in bonding and anti-bonding orbitals. The paramagnetism of molecules arise from the presence of unpaired electron(s) in the molecule and the MO theory can predict the presence or absence of unpaired electron(s) in the molecule. The Lewis theory does nothing to account for the presence of unpaired electron(s) and hence, cannot predict the paramagnetism of molecules.

Ans: (d)

31. MO theory employs the concept of bonding and antibonding orbitals and these orbitals are exclusive to the MO theory. MO theory doesn’t require the concept of hybridization unlike VB theory. The only common grounds for both the theories are sigma and pie ( and ) bonds.

Ans: (c)

32. MO theory explains and gives a clear picture of double bonds. Double bonds are formed by the parallel overlap of delocalized electrons and MO theory treats all atoms as having delocalized electrons and hence orbitals. However, an essential requirement of the VB theory is that orbitals are concentrated on atoms.

Ans: (c)

33. VB theory explains and gives a clear picture of molecular geometry. VB theory invokes the concept of hybridization to explain molecular shapes whereas MO theory starts from the fact that we know the molecular geometry and the shape of the molecule from before.

Ans: (d)

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