WorksheetsHydrocarbons
Total questions: 15
Worksheet time: 11mins
Name
Class
Date
1.
How many structural isomers are there for C4H10?
a)
1
b)
2
c)
3
d)
4
2.
When naming organic compounds:
a)
only the longest chain is included
b)
the parent chain must be in a straight line in the diagram
c)
the substituent groups are listed in numerical order
d)
the substituent groups are listed in alphabetical order
3.
What is the correct name for the following compound?
a)
3,4-dimethylheptane
b)
4-methyl-5-ethylhexane
c)
3-methyl-4-propylpentane
d)
4,5-dimethylheptane
4.
What is the correct name for the alkyne shown?
a)
butyne
b)
1-butyne
c)
2-butyne
d)
1-methyl-1-propyne
5.
Which compound has the highest boiling point?
a)
ethane
b)
butane
c)
pentane
d)
2-methylbutane
6.
The main intermolecular force of attraction between hydrocarbons is:
a)
covalent bonds
b)
hydrogen bonds
c)
dipole–dipole forces
d)
dispersion forces
7.
Alkenes are:
a)
saturated, because they do not have the maximum number of hydrogen atoms
b)
unsaturated, because they do not have the maximum number of hydrogen atoms
c)
unsaturated, because they have the maximum number of hydrogen atoms
d)
aromatic compounds
8.
Compounds containing one or more benzene rings are called:
a)
alkanes
b)
alicyclic compounds
c)
aliphatic compounds
d)
aromatic compounds
9.
When a carbon atom has four single bonds, the geometrical arrangement of atoms around it is described as:
a)
trigonal pyramid
b)
tetrahedral
c)
planar
d)
linear
10.
Which of the following is an isomer of 2,2-dimethylheptane?
a)
2,2,3-trimethylpentane
b)
2,2,3,3-tetramethylpentane
c)
Octane
d)
2-methyl-3-ethylpentane
11.
Which of the following is correct about structural isomers?
a)
They have different molecular formulas
b)
They must have any double or triple bonds in the same position
c)
They can be either positional or chain isomers
d)
They must have the same length main chain
12.
Which of the following statements about benzene is incorrect?
a)
It contains a ring of delocalised electrons
b)
It is very reactive and unstable
c)
It has formula C6H6
d)
It is very stable and hard to chemically react
13.
Pentane has a higher boiling point than ethane because it forms:
a)
a stronger type of secondary force between molecules
b)
the same number of dispersion forces between molecules, but the individual dispersion forces are stronger
c)
stronger overall dispersion forces due to an increased number of electrons in the molecule
d)
stronger overall dispersion forces due to an increased number of hydrogen atoms in the molecule
14.
Alkanes have various uses related to their molecule size and state. Which of the following is an incorrect statement?
a)
Longer chain molecules are used as lubricants and fuel oils
b)
Ethene is used as a feedstock for polymers and other industrially produced chemicals
c)
Hexane is the main component of petrol
d)
Methane is the main component of natural gas
15.
The general formulas for alkanes, alkenes and alkynes are:
a)
alkane: CnH2n+2
alkene: CnH2n
alkyne: CnH2n-2
b)
alkane: CnH2n
alkene: CnH2n+2
alkyne: CnHn+4
c)
alkane: CnH2n-2
alkene: CnH2n
alkyne: CnH2n+2
d)
alkane: CnH2n+2
alkene: CnH2n
alkyne: CnHn-4
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