Assignment 05 A
1- Appropriate hybridization schemes for the C atoms in molecular CH3CO2H are:
a)
b)
c)
d)
sp3 and sp
sp3 and sp2
sp2 and sp
sp3 and sp3
2- sp3 hybridization would not be appropriate for the central atom in:
a)
b)
c)
d)
SiF4
[PCl4]+
XeF4
[Me4N]+
3- In the equation for the normalized wavefunction: 
sp
= N2s + N2p, N =
a) ½
b) 1
c) 1/√2
d) √2
4- sp hybridization for the C atom in CS2 is all that is required to allow for :
a) the formation of two C=S bonds
b) the formation of the  components of two double bonds
c) the formation of two  bonds and two  bonds
d) the formation of a  bond and accommodation of one lone pair
5- In an MO diagram for the formation of H2O in which the z axis bisects the H–O–H angle:
a)
b)
c)
d)
the O 2pz atomic orbital interacts with an in-phase combination of H 1s atomic orbitals
the O 2pz atomic orbital interacts with an out-of-phase combination of H 1s atomic orbitals
the O 2pz atomic orbital is non-bonding
the O 2s atomic orbital is non-bonding
6- Which statement is true about the bonding in B2H6?
a) A localized bonding picture can be developed for B2H6 in which each B atom obeys the octet
rule.
b) Bonding pictures for B2H6 involve multicentre bridge bonds.
c) B-H terminal bonds cannot be considered as 2c-2e interactions.
d) The observed structural parameters in B2H6 suggest the presence of a localized B-B interaction.
7- The bonding in [NO3]– can be considered in terms of a set of three resonance structures which
describe the predominant contributions to the bonding. Which statement is incorrect about
this se of resonance structures?
a)
b)
c)
d)
Each resonance structure possesses two localized N=O double bonds.
N carries a formal positive charge in each resonance structure.
The set of resonance structures has to account for the equivalence of the N–O bonds.
The N atom obeys the octet rule in each resonance structure.
8- Figure 5.29 in Inorganic Chemistry gives a MO diagram for the formation of [HF2]–.
Which statement is incorrect about this bonding picture?
a)
b)
c)
d)
The bond order of each H–F bond is 1.
There is one MO with net bonding character.
The bonding can be described as a 3-centre 2-electron interaction.
The σg* MO contains 3 nodal planes.
Seleted Problems (from the text book):
4, 5, 6, 7, 8, 9, 15, 16, 22, 27