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Organic Chemistry I (Chem 112) (Phrm 135) (Dpht 017) Question Paper

Organic Chemistry I (Chem 112) (Phrm 135) (Dpht 017)

Course:Pure And Applied Sciences

Institution: Kenya Methodist University question papers

Exam Year:2013

TIME : 2 HOUR

INSTRUCTIONS
Question One
With a named example explain the meaning of the following
Single bond
Double bond
Triple bond
Bond polarity
Electronegativity
(10 Marks)
Using water molecule, describe VSEPR (Valence Shell Electron Pair Repulsion)
(4 marks)
It is observed that benzene has no dipole moment. While water has 1.85 D. explain the reason to this observation
(4 Marks)
Given the molecules
CH3NO2
CH3NH2
Assign a formal charge to each of the molecule
(4 Marks)
Draw resonance structures for each
(4 Marks)
Write a resonance hybrid for each
(4 marks)

Question Two
Using wedge structures and Lewis structures draw the molecules named below
Cyclo-pentenol
(6 Marks)
Ephedrine
(8 marks)
2-cyclolhexenone
(6 marks)

Question Three
Write any three constitutional isomers of C6H12
(6 marks)
Given the molecules C4H8 and C4H10
Draw Neman projections and show the cycles from totally eclipsed to totally eclipsed for C4H10
(8 marks)
Draw a chair and a boat conformations
(4 Marks)
In each case state the most stable conformer
(2 marks)

Question Four
(i) Write the propagations steps that leads to formation of chloromethane from methane
(2 marks)
(ii) Explain why this type of halogenation usually gives mixture of products (2 Marks)
Describe the differences between
SN1 and SN2
(4 marks)
E1 and E2
(4 marks)
E1 and SN1
(4 marks)
E2 and SN2
(4 marks)

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