Hwa Chong Institution
CHEMISTRY
Worksheet – Organic Chem I
Name: __________________(
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Class: 4 ____
Date: _________
“When chlorine reacts with an organic compound Z, only one product is obtained.”
What conclusion can be drawn from the above statement ?
A
Compound Z is an alkane.
B
The reaction is catalysed by diffused light.
C
The reaction is rather slow at room temperature.
D
An addition reaction has taken place.
(
)
Which of the following organic compounds would you expect to find in naptha?
A
C2H4
B
C3H8
C
C8H18
D
C5H12O
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)
A hydrocarbon was found to contain 17.2% hydrogen by mass. Its empirical formula is
A
CH2
B
C2H2
C
C2H4
D
C2H5
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)
Which of these lists of petroleum fractions is arranged in order of increasing boiling
point ?
A
Lubricating oil, petrol, paraffin, diesel
B
Paraffin, petrol, diesel, lubricating oil
C
Petrol, diesel, paraffin, lubricating oil
D
Petrol, paraffin, diesel, lubricating oil
(
)
When 1 volume of gas X reacts with exactly 5 volumes of oxygen it forms carbon dioxide
and water only. What is gas X?
A
Methane, CH4
B
Ethane, C2H6
C
Propane, C3H8
D
Butane, C4H10
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)
(
)
Which of the following properties of alkanes does not increase as relative molecular
mass increases ?
A
B
C
D
Flammability
Melting point
Viscosity
reactivity
By Mrs. Liew SG/Science Department /HCI
Page 1
Hwa Chong Institution
7
8
Cholesterol is an organic molecule that occurs in the blood stream.
Which type of compound is cholesterol?
A
An acid
B
An alcohol
C
An alkane
D
An alkene
(
)
Which sample contains the most unsaturated hydrocarbons ?
(
)
Which type of reaction occurs between propene and hydrogen ?
A
Addition
B
Dehydration
C
Oxidation
D
substitution
(
)
(
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Equal masses of coconut oil, butter, margarine and palm oil are separately dissolved in an
organic solvent.
A few drops of aqueous bromine are added to each solution and the mixtures are
shaken. The table shows the results.
A
B
C
D
9
CHEMISTRY
sample
Butter
Coconut oil
Margarine
Palm oil
colour of mixture
Orange
Dark orange
Yellow
Colourless
10 Which of the following statements about the homologous series of alkanes is not true ?
A
They are hydrocarbon compounds.
B
They can be represented by a general formula.
C
They exhibit a gradual change of physical properties.
D
They have the same empirical formula.
11 (a)
(b)
“Bananas produce ethene gas as they ripen”. Suggest how you would confirm the
production of ethene gas ?
Draw all the possible structural formulae of C4H8
 THE END 
By Mrs. Liew SG/Science Department /HCI
Page 2