FNSC 1064
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FINAL EXAMINATION
SCHOOL OF LIBERAL STUDIES
Sept Semester 2013
CHEMISTRY B
1 Hours
DATE: 23rd OF OCTOBER 2013
TIME:
This paper contains TWO (2) Sections on FIVE (5) printed pages, including the
cover.
Answer ALL questions in SECTION A & B. All answers should be written in the
answer booklet.
Any misconduct found during the paper will constitute a mark of 0 for the
paper and you WILL be asked to LEAVE the exam hall IMMEDIATELY.
This paper comprises 20% of the total marks of the Final Assessment.
Registration number from Student Card – to be completed by student
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FNSC 1064
SECTION A
(10 Marks)
This section contains TEN (10) objectives question. Answer ALL questions in
this section.
1.
Carbon is able to bond with other elements in many different ways because it
has
A.
B.
C.
D.
2.
Six protons
Four electrons
Six valence electrons
Four valence electrons
How many secondary carbon atoms are there in
CH3
H3C
CH3
H2
C
C
C
H
CH3
CH3
A.
B.
C.
D.
3.
1
2
3
4
Give the name for the aromatic alkanes
CH3
CH2CH3
A.
B.
C.
D.
1-methyl-3-ethylcyclohexane
1-ethyl-3-methylcyclohexane
1,3-ethylmethylcyclohexane
3-ethyl-1-methylcyclohexane
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FNSC 1064
4.
Name the following alkane
CH3
CH3
C
H
H2
C
H
C
H2
C
CH3
CH3
A.
B.
C.
D.
5.
3-methyl-5-methylhexane
2-methyl-4-methylhexane
2,4-dimethylhexane
3,5-dimethylhexane
Arrange the compounds below in order of increasing boiling point
CH3CH2CH3
Propane
A.
B.
C.
D.
6.
CH3(CH2)7CH3
Nonane
Pentane
Pentane < nonane < propane
Nonane < pentane < propane
Pentane < propane < nonane
Propane < pentane < nonane
Ethane reacts with chlorine in the presence of sunlight. Which of the following
statements about the intermediates of the reaction is correct?
A.
B.
C.
D.
7.
CH3CH2CH2CH2CH3
They are more energetically stable than the reactants
They contain odd number of electron
They are positively charged ions.
They react to form HCl
The reaction of bromine with methane in sunlight is an example of
A.
B.
C.
D.
Elimination
Addition
Free radical addition
Free radical substitution
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FNSC 1064
8.
What is the mechanism when bromine attacks ethane
A.
B.
C.
D.
9.
Which of the following is a secondary haloalkane?
A.
B.
C.
D.
10.
Free radical substitution
Electrophilic addition
Electrophilic substitution
Nucleophilic addition
CH3Br
CH3CH2Br
CH3CHBrCH3
(CH3) 2CHCHBr2
Which of the following compounds could be prepared by reacting bromoethane
with potassium cyanide and then hydrolyzing the product in dilute acid?
A.
B.
C.
D.
CH3CH3
CH3CH2CN
CH3CH2CH3
CH3CH2COOH
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FNSC 1064
SECTION B
(30 Marks)
This section contains THREE (3) short essay questions. Answer ONLY TWO (2)
questions in this section.
1. The mechanism of chlorination of methane consist of three steps; Initiation, chain
propagation and termination. Draw the mechanism for each step.
(15marks)
2.
Name the following compounds according to the IUPAC nomenclature:
(a)
CH3
CH3C CH2CH2CH3
CH3CHCH3
CH3CHCH3
(b)
CH3CH CH2CH CHCH3
C2H5
C2H5
CH3
(c)
CH3CH2
CH3
CH3
Br
(d)
H3C
CH2CH3
(e)
(15marks)
2.
Draw the structural formula for each of the following compounds:
(a)
1,1-dichloro-3-methylcyclohexane
(b)
3-cyclohexyl-2,2-dimethylbutane
(c)
1-bromo-5-chloro-3-ethyl-3-methylpentane
(d)
5-sec-butyl-2,4-dimethylnonane
(e)
trans-1,4 -dichloro-2-butene
(15mark)
-END OF QUESTIONS5