Multiple Choice Questions (MCQ) topic quiz
4.1 Basic Concepts and Hydrocarbons
Instructions and answers for teachers
These instructions cover the learner activity section which can be found on page 7. This
Lesson Element supports OCR AS and A Level Chemistry A.
When distributing the activity section to the learners either as a printed copy or as a
Word file you will need to remove the teacher instructions section.
The Activity
This Lesson Element is a teaching and learning resource containing 10 multiple choice
questions (MCQs) on the theme of basic concepts and hydrocarbons. Some questions might
require synoptic thinking, using knowledge and ideas from various topics across the full A
Level content.
This resource can be used to test and consolidate understanding at the end of a topic or to
revisit and refresh knowledge at a later point in the course.
Learning Outcomes
This lesson element relates to the specification learning outcomes 4.1.1(a), 4.1.1(c), 4.1.1(f),
4.1.2(c), 4.1.2(f), 4.1.3(b), 4.1.3(c), 4.1.3(h), 4.1.3(i), 4.1.3(j), 4.1.3(k).
Introduction
Multiple choice questions allow rapid coverage of a wide range of sub-topics.
Contrary to a widespread belief among students, multiple choice questions are not
necessarily easy – they can be easy, moderate or difficult.
The questions are written so that the incorrect answers are plausible distractors based on
common errors or misconceptions.
The questions in this quiz cover topics mainly from specification sections:
4.1 Basic Concepts and Hydrocarbons.
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© OCR 2015
Multiple Choice Questions (MCQ) topic quiz - answers
1.
What is the correct name for the compound CH3CH2CH(CH3)CH(OH)CH3?
A
2-ethylbutan-3-ol
Incorrect, they have not found the longest chain or
named from the correct end.
B
3-ethylbutan-2-ol
Incorrect, they have not found the longest chain.
C
2-methylpentan-3-ol
Incorrect, they have started the naming with the methyl
group rather than the functional group.
D
3-methylpentan-2-ol
Correct answer.
Your answer
2.
Which is unsaturated, aliphatic and has alkyl chains?
A
cyclohexane
Incorrect, they do not understand the term unsaturated
or alkyl chains.
B
2-methylpropene
Correct answer.
C
2,3-dimethyloctane
Incorrect, they do not understand the term unsaturated.
D
1,3-dimethylbenzene
Incorrect, they do not understand the term aliphatic.
Your answer
3.
B
Which pair are within the same homologous series?
A
butane and methylpropane
Incorrect, they are mixing it up with structural
isomers.
B
ethane and ethanol
Incorrect, they are explaining homologous by
number of carbons.
C
heptane and octane
Correct answer.
D
prop-1-enol and prop-2-en-1-ol
Incorrect, they are mixing it up with structural
isomers.
Your answer
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D
2
C
© OCR 2015
4.
Which mechanism involves heterolytic fission?
A
C2H4 + HBr  C2H5Br
Correct answer. The HBr splits forming a
carbocation and Br–.
B
C2H6 + Br2  C2H5Br + HBr
Incorrect, the free radical substitution involves
homolytic fission.
C
O3 + O•  2O2
Incorrect, another free radical substitution.
D
none of the above
Incorrect.
Your answer
5.
A
Which substance would have the highest boiling point?
A
2,2-dimethylpropane
Incorrect, they may have learned the rules
backwards.
B
2,3-dimethylpentane
Incorrect.
C
heptane
Correct answer. This has the most points of
contact and greatest induced dipole–dipole
interactions.
D
2-methylheptane
Incorrect, they may think that increased Mr
causes increased boiling points.
Your answer
6.
What is the bond angle across the C=C–Cl bond in 1-chloroprop-1-ene?
A
104.5o
Carbon has no lone pairs so the shape is
never bent/non-linear.
B
107o
Carbon has no lone pairs so the shape is
never pyramidal.
C
109.5o
Incorrect, they may have picked the carbon
without a double bond.
D
120o
Correct answer. The double bond causes 3
regions of electron density and no lone pairs.
Your answer
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C
3
D
© OCR 2015
7.
Which will not show E/Z isomerism?
A
1,2-dichloroethene
Incorrect, they may think the symmetry stops
isomerism.
B
2-methylpropene
Correct answer. The first carbon has two
hydrogens so rotation does not cause isomers
C
but-2-ene
Incorrect, they may think the symmetry stops
isomerism.
D
hex-1,3-diene
Incorrect, the first bond does not have
stereoisomers but the third does.
Your answer
8.
Which is the most common product of the reaction between HBr and
3-methylpent-2-ene?
A
2,3-dibromo-3-methylpentane
This would be the product if Br2 instead of HBr
was used.
B
2-bromo-3-methylpentane
Incorrect, they have misinterpreted
Markownikoff's rule.
C
2,4-dibromo-3-methylpentane
Incorrect, they do not understand that the HBr
must attach to the carbons in the double bond.
D
3-bromo-3-methylpentane
Correct answer. Markownikoff's rule predicts
that the H will attach to the carbon with the
most hydrogens on.
Your answer
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B
4
D
© OCR 2015
9.
Which picture shows the polymer formed from 2-bromobut-2-ene?
Incorrect, one of the methyl groups is missing.
A
B
Incorrect, a common mistake, the repeat unit
will only have 2 carbons in the chain.
C
Correct answer.
D
Incorrect.
Your answer
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C
© OCR 2015
10.
Which of the following statement(s) is/are true?
1) Photodegradable polymers form CO2 and H2O when they break down.
2) Plastics can be formed from renewable and non-renewable sources.
3) Halogenated polymers can produce toxic chemicals when burned.
A
1, 2 and 3
Incorrect.
B
only 1 and 2
Incorrect.
C
only 2 and 3
Correct answer. HCl can be formed during
combustion which is toxic.
D
only 1
Incorrect, it is biodegradable which produce
water and carbon dioxide.
Your answer
C
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© OCR 2015
Multiple Choice Questions (MCQ) topic quiz
4.1 Basic Concepts and Hydrocarbons
Learner Activity
1.
What is the correct name for the compound CH3CH2CH(CH3)CH(OH)CH3?
A
2-ethylbutan-3-ol
B
3-ethylbutan-2-ol
C
2-methylpentan-3-ol
D
3-methylpentan-2-ol
Your answer
2.
Which is unsaturated, aliphatic and has alkyl chains?
A
cyclohexane
B
2-methylpropene
C
2,3-dimethyloctane
D
1,3-dimethylbenzene
Your answer
3.
Which pair are within the same homologous series?
A
butane and methylpropane
B
ethane and ethanol
C
heptane and octane
D
prop-1-enol and prop-2-en-1-ol
Your answer
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© OCR 2016
4.
Which mechanism involves heterolytic fission?
A
C2H4 + HBr  C2H5Br
B
C2H6 + Br2  C2H5Br + HBr
C
O3 + O•  2O2
D
none of the above
Your answer
5.
Which substance would have the highest boiling point?
A
2,2-dimethylpropane
B
2,3-dimethylpentane
C
heptane
D
2-methylheptane
Your answer
6.
What is the bond angle across the C=C–Cl bond in 1-chloroprop-1-ene?
A
104.5o
B
107o
C
109.5o
D
120o
Your answer
7.
Which will not show E/Z isomerism?
A
1,2-dichloroethene
B
2-methylpropene
C
but-2-ene
D
hex-1,3-diene
Your answer
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© OCR 2016
8.
Which is the most common product of the reaction between HBr and
3-methylpent-2-ene?
A
2,3-dibromo-3-methylpentane
B
2-bromo-3-methylpentane
C
2,4-dibromo-3-methylpentane
D
3-bromo-3-methylpentane
Your answer
9.
Which picture shows the polymer formed from 2-bromobut-2-ene?
A
B
C
D
Your answer
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© OCR 2016
10.
Which of the following statement(s) is/are true?
1) Photodegradable polymers form CO2 and H2O when they break down.
2) Plastics can be formed from renewable and non-renewable sources.
3) Halogenated polymers can produce toxic chemicals when burned.
A
1, 2 and 3
B
only 1 and 2
C
only 2 and 3
D
only 1
Your answer
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10
© OCR 2016