Alkenes Multiple Choice Quiz
1. The general formula for alkenes is...
C n
H n
C n
H
2n-2
C n
H
2n
C n
H
2n+2
2. The empirical formula of cyclohexene is ...
CH
CH
2
C
3
H
5
C
6
H
10
3. Which of the following straight chain alkenes has the highest boiling point?
C
2
H
4
C
3
H
6
C
4
H
8
C
5
H
10
4. What is the name of the compound with the structural formula,
CH
3
CH(CH
3
)CH=CH
2
?
pent-1-ene
2-methylbutane
2-methylbut-3-ene
3-methylbut-1-ene
5. The number of structural isomers of alkenes with the molecular formula C
4
H
8
is...
2
3
4
5

6. The bond angles in ethene are...
all 120°
all 109.5°
all 90°
a combination of 109.5° and 120°
7. Which one of the following is not a planar molecule?
chloroethene
ethene
propene
tetrafluoroethene
8. Which one of the following statements about alkenes is not true?
they are unsaturated hydrocarbons
they undergo addition reactions
they can be attacked by electrophiles
they all have the general formula C n
H
2n
9. Which one of the following statements about cis and trans isomers is not true?
they are geometrical isomers
their atoms occupy similar positions in space
they have different melting points
they have different boiling points
10. Which one of the following is statements about geometrical isomerism is not true?
it occurs in pent-1-ene
it is a form of stereoisomerism
it occurs in pent-2-ene
it results from the restricted rotation of double bonds

11. Which one of the following isomers of molecular formula C
4
H
8
can exist in two forms?
but-1-ene
but-2-ene
2-methylpropene
cyclobutane
12. Which of the following products is/are formed when HBr reacts with pent-2-ene?
CH
3
CHBrCH
2
CH
2
CH
3
and CH
2
BrCH
2
CH
2
CH
2
CH
3
CH
3
CHBrCH
2
CH
2
CH
3
only
CH
3
CHBrCH
2
CH
2
CH
3
and CH
3
CH
2
CHBrCH
2
CH
3
CH
3
CHBrCHBrCH
2
CH
3
only
13. Which one of the following statements about the reaction between HBr and propene is not true?
it proceeds via an electrophilic addition mechanism
the intermediate organic species contains a carbocation
only 1-bromopropane is produced
a bromide ion is involved in the second of the two steps
14. The compound formed when bromine reacts with but-1-ene is...
1-bromobutane
2-bromobutane
1,3-dibromobutane
1,2-dibromobutane
15. Which of the following statements about the hydrogenation of alkenes is not true?
the reaction involves reduction of an alkene
the reaction can be catalysed by nickel
the reaction involves substitution
vegetable oil can be converted to margarine by this method

16. Which of the following statements about the reaction between steam and ethene is not true?
it is a low temperature process
it uses a phosphoric acid catalyst
it produces ethanol
it involves addition
17. Which one of the following compounds cannot undergo addition polymerisation?
CF
2
=CF
2
CH
3
CH
2
Cl
phenylethene
ethene
18. The repeating unit in a poly(propene) molecule is..
-[CH
2
- CH
2
]-
-[CH
2
- CH(CH
3
)]-
-[CH = C(CH
3
)]-
-[CH(CH
3
) - CH(CH
3
)]-
19. Which of the following statements about poly(propene) is not true?
it is an addition polymer
it reacts readily with acids
it is used to make ropes and crates
it contains only single covalent bonds
20. Which of the following statements about addition polymerisation is not true?
monomers are converted into polymers
some atoms in the monomers are not used in the polymer
saturated hydrocarbons don’t undergo addition polymerisation
during the process double covalent bonds are converted into single covalent bonds http://www.knockhardy.org.uk/sci_htm_files/mcene.HTM

Answers
1.
C
2.
C
3.
D
4.
D
5.
B
6.
A
7.
C
8.
D
9.
B
10.
A
11.
B
12.
C
13.
C
14.
D
15.
C
16.
A
17.
B
18.
B
19.
B
20.
B