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WorksheetsAlkenes - intervention session 2
Total questions: 20
Worksheet time: 20mins
What type of bonds are formed when the p orbitals of two carbon atoms overlap with each other?
π bonds
σ bonds
Ionic bonds
Hydrogen bonds
Which of the following statements is true about the bonding in alkenes?
Two π bonds are formed with other atoms.
Three σ bonds are formed with other atoms.
One π bond is formed with the other carbon atom of the double bond.
Four σ bonds are formed with other atoms.
What is the bond angle in a planar arrangement of an alkene molecule?
90°
109.5°
120°
180°
What is the characteristic of cis isomers in alkenes?
They have two groups on opposite sides of the double bond.
They have two groups on the same side of the double bond.
They have no groups attached to the double bond.
They have groups that rotate freely around the double bond.
What is the difference between E/Z isomerism and cis/trans isomerism?
E/Z isomerism occurs when the atoms or groups attached to each carbon atom of the C=C bond are the same.
Cis/trans isomerism occurs when different atoms or groups of atoms are attached to each carbon atom of the C=C bond.
E/Z isomerism occurs when different atoms or groups of atoms are attached to each carbon atom of the C=C bond.
Cis/trans isomerism occurs when the atoms or groups attached to each carbon atom of the C=C bond are different.
Why can't 2-methylpropene have cis/trans isomers?
Because it has a triple bond
Because the methyl groups are on the same side of the C=C bond
Because it has a single bond
Because it has identical groups on both sides of the C=C bond
What rule is used to determine the priority of groups in E/Z isomers?
Markovnikov's rule
Hund's rule
Cahn-Ingold-Prelog (CIP) priority rules
Pauli exclusion principle
Why are alkenes more reactive than alkanes?
Due to the presence of a C-H bond
Due to the presence of a C-C single bond
Due to the presence of a C=C bond
Due to the presence of a C-O bond
What happens to bromine water when it reacts with an unsaturated compound?
It turns orange
It decolourises
It turns red
It remains the same
What conditions are required for the hydration of alkenes?
Steam at 300°C, 60 atmospheres, and sulphuric acid or phosphoric acid catalyst
Steam at 100°C, 1 atmosphere, and sulphuric acid catalyst
Water at 25°C, 1 atmosphere, and phosphoric acid catalyst
Steam at 200°C, 30 atmospheres, and hydrochloric acid catalyst
Why is the industrial hydration of alkenes important?
It produces large quantities of ethanol, a widely used solvent and fuel.
It produces large quantities of methanol, a widely used solvent and fuel.
It produces large quantities of propanol, a widely used solvent and fuel.
It produces large quantities of butanol, a widely used solvent and fuel.
What is electrophilic addition?
The addition of an electrophile to an alkene double bond, C=C
The addition of a nucleophile to an alkene double bond, C=C
The addition of an electrophile to an alkane single bond, C-C
The addition of a nucleophile to an alkane single bond, C-C
Why is the alkene double bond, C=C, susceptible to attack by electrophiles?
Because it is an area of high electron density
Because it is an area of low electron density
Because it is an area of high proton density
Because it is an area of low proton density
Why is a hydrogen halide molecule polar?
Because the hydrogen and halogen atoms have different electronegativities
Because the hydrogen and halogen atoms have the same electronegativity
Because the hydrogen atom is larger than the halogen atom
Because the halogen atom is larger than the hydrogen atom
In the electrophilic addition of hydrogen bromide (HBr) to an alkene, what role does the H atom play?
It acts as an electrophile by accepting a pair of electrons from the C=C bond in the alkene
It acts as a nucleophile by donating a pair of electrons to the C=C bond in the alkene
It acts as a catalyst
It acts as a solvent
What is formed when the H-Br bond breaks heterolytically during electrophilic addition?
A Br⁻ ion
A H⁺ ion
A Br⁺ ion
A H⁻ ion
In the electrophilic addition mechanism, what must the curly arrows show?
The movement of a single electron
The movement of a pair of electrons
The movement of protons
The movement of neutrons
What are carbocations?
Positively charged carbon atoms with only three covalent bonds
Negatively charged carbon atoms with four covalent bonds
Positively charged carbon atoms with four covalent bonds
Negatively charged carbon atoms with three covalent bonds
Which type of carbocation is the most stable?
Primary carbocation
Secondary carbocation
Tertiary carbocation
All are equally stable
According to Markownikoff's rule, where does the halogen end up in an electrophilic addition reaction of a hydrogen halide (HX) to an alkene?
On the least substituted carbon atom
On the most substituted carbon atom
On the carbon atom with the least hydrogen atoms
On the carbon atom with the most hydrogen atoms
