WorksheetsAlkenes
Total questions: 39
Worksheet time: 34mins
The mechanism of the reaction represented by the equation C₂H₄ + Br₂ → CH₂BrCH₂Br is an example of
A. Free radical substitution
B. Free radical addition
C. Electrophilic substitution
D. Electrophilic addition
Propene reacts with hydrogen chloride gas to give mainly
1-chloropropane (CH₃CH₂CH₂Cl)
2-chloropropane (CH₃CHClCH₃)
3-chloroprop-1-ene (CH₂=CHCH₂Cl)
1,2-dichloropropane (CH₃CHClCH₂Cl)
Which of these compounds will show geometric (E–Z or cis/trans) isomerism?
A
B
C
D
This question is about the organic compounds with skeletal formulae as shown: Which compound reacts with acidified potassium manganate(VII) to form a diol?
A
B
C
D
In the reaction between ethene and bromine, the bromine molecule acts as an electrophile. CH2=CH2 + Br2 → BrCH2CH2Br. Which of the following statements is true?
A) Ethene acts as a nucleophile because it is polar.
B) Ethene acts as a nucleophile because it can donate a pair of electrons to bromine.
C) Ethene is not a nucleophile in this reaction.
D) Ethene acts as a nucleophile because it donates a single electron to bromine.
All alkenes have:
the same empirical formula and the same general formula.
the same molecular formula and the same general formula.
the same molecular formula and the same empirical formula.
the same empirical formula and the same structural formula.
This question concerns the reaction of hydrogen bromide with propene. (c) The major product of the reaction will be:
1-bromopropane
2-bromopropane
1,2-dibromopropane
2-bromopropene
In propene, CH₂=CH—CH₃,
the C=C double bond is longer and stronger than the C—C single bond.
the C=C double bond is shorter and stronger than the C—C single bond.
the C=C double bond is shorter and weaker than the C—C single bond.
the C=C double bond is longer and weaker than the C—C single bond.
How does the carbon-carbon bond in pvc compare with that in chloroethene?
longer stronger
longer weaker
shorter stronger
shorter weaker
When bromine reacts with propene in an organic solvent at room temperature, what is the mechanism by which the bromine attacks the propene?
electrophilic addition
electrophilic substitution
nucleophilic addition
nucleophilic substitution
What is/are the product(s) of the reaction between ethene and hydrogen bromide?
CH3CH2Br
CH3CH2Br and H2
CH2BrCH2Br
CH2BrCH2Br and H2
If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
20
22
40
42
Hydrocarbons are compounds that contain
Carbon, only
Carbon and Hydrogen, only
Carbon, Oxygen, and Hydrogen, only
Carbon, Oxygen, Hydrogen, and Nitrogen, only
Classify the compound based on the functional group present.
alkane
alkene
alkyne
aromatic
What is the name of this molecule?
But-1-ene
Prop-2-ene
Pent-2-ene
Hex-3-ene
The formula for ethene is
C2H4
C2H6
CH4
C3H6
Which of these alkenes can exist as E/Z (or cis-trans) isomers?
But-1-ene
But-2-ene
Propene
Methylpropene
What is the name of the mechanism when ethene reacts with chlorine?
Electrophilic substitution
Electrophilic addition
Free radical substitution
Nucleophilic addition
When HBr reacts with propene, what is the name of the major product?
1-bromopropene
2-bromopropene
1-bromopropane
2-bromopropane
Which diagram shows the correct structure for a repeating unit of polypropene?
Molecules with the same structural formula but a different spatial arrangement of atoms are:
Isotopes
Structural isomers
Hydrocarbons
Stereoisomers
Complete the formula of this alkane C26H (a)
To test for alkenes we can add a hydrocarbon to ________________ water
flourine
chlorine
bromine
iodine
Name the two products of complete combustion of a hydrocarbon
(a)
Which of the following would have the highest melting point?
C3H8
C4H8
C5H12
C22H44
When testing for alkenes (unsaturation) bromine water turns from...
orange --> blue/black
colourless --> pink
orange --> colourless
orange --> clear
This type of bond allows free rotation of the parts of the molecule with respect to each other
Sigma bond
Pi bond
Covalent bond
Electron bond
Which bond is weaker and is more prone to chemical attacks?
Pi bond
Sigma bond
How to determine that a molecule exhibit cis-trans isomerism?
Restricted rotation in a carbon-carbon single bond of alkenes
Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it
Exist in cyclic compouds only
Similar chemical properties
Isomerism that arises out of the difference in spatial arrangement of atoms or groups about the doubly bonded carbon atoms are called?
Structural Isomerism
Stereoisomerism
Geometrical Isomerism
Optical Isomerism
Chlorination of alkanes is an example of
Elimination reaction
Free radical substitution reaction
Nucleophilic substitution reaction
Electrophilic addition reaction
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
The two Geometric isomers shown are called:
Cis/trans 1,2 dichloroethane
Cis/trans 1,2 dichloroethene
Cis/trans 1,2 chloroethane
Cis/trans 1,2 chloroethene
Which of the following reactions is an example of an electrophilic addition reaction?
Hydrogenation of alkenes
Chlorination of alkanes
Hydration of alkenes
Dehydration of alcohols
What type of isomerism is exhibited by but-2-ene?
Structural isomerism
Geometrical isomerism
Optical isomerism
Conformational isomerism
Which of the following alkenes will not show cis-trans isomerism?
Hex-3-ene
Pent-2-ene
But-2-ene
2-methylpropene
Which of the following reactions is an example of electrophilic addition?
Hydrogenation of alkenes
Dehydration of alcohols
Hydration of ethene
Chlorination of methane
What is the major product when but-1-ene reacts with hydrogen bromide?
2,3-dibromobutane
1,2-dibromobutane
2-bromobutane
1-bromobutane
Which of the following alkenes will show cis-trans isomerism?
2-methylpropene
But-2-ene
But-1-ene
Propene
