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Coordination Chemistry And Organometallic Chemistry Question Paper

Coordination Chemistry And Organometallic Chemistry

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2008

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2007/2008
INSTITUTE OF OPEN LEARNING

SPECIAL EXAMINATION FOR THE DEGREE OF
BACHELOR OF EDUCATION AND BACHELOR OF SCIENCE

SCH 301: COORDINATION CHEMISTRY AND ORGANOMETALLIC
CHEMISTRY

DATE: Wednesday 8th October 2008 _____________TIME: 8.00am – 10.00am
INSTRUCTIONS: Answer ALL questions.

Q1.
(a)
Explain what you understand by the phrase “Co-ordination Complex” and
give a specific example of a co-ordination complex with:
(i)
Copper as the central atom
(ii)
Phosphorus as the central atom
(iii)
Platinum as the central atom

[11 marks]
(b)
Draw the structure of naturally-occurring co-ordination complex with iron
as the central atom, showing clearly the following features:

(i)
Nature of the macrocyclic ring system

[4 marks]
(ii)
The degree of unsaturation of this ring (i.e number of double
bonds)
[4
marks]
(iii)
The side groups attached to the macrocyclic ring. [4 marks]
(c)
State the biological role of the complex that you have drawn. [2 marks]

[Total
for
Q1
=25
marks]

Q2.
List FIVE factors that affect the stability of co-ordination complexes and, for each
factors listed, give a specific example to illustrate how the factor chosen is
responsible for the observed stability of the complex. [25
marks]

1
Q3.
(a)
Outline very briefly the basic principles of the Crystal Field Theory
pointing clearly its merits and its
drawbacks.
[12
marks]

(b)
Calculate the number of unpaired electrons in the complex formed when
ferrous carbonate, FeCO3, is:
(i)
dissolved in dilute hydrochloric acid

[5 marks]
(ii)
Excess potassium cyanide is added to the solution got 3(b) (i)
above.
[8
marks]
[Total
for
Q3
=
25
marks]

Q4.
(a)
Explain what you understand by the phrase “organometallic” complex and
give examples of FOUR specific
complexes.
[6
marks]
(b)
Draw the possible structures and give systematic IUPAC names of the
following complexes:
(i)
[CoCl4]=2-

[2 marks]
(ii)
[Co(en)2(NH3)2]2+

[4 marks]
(iii)
Mo(CO)6

[2 marks]
(iv)
(C5H5)2Fe

[4 marks]
(v)
[Cr(NH3)4(H2O)2

[6 marks]

[Total for Q4 = 25 marks]

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Coordination Chemistry And Organometallic Chemistry Question Paper

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