Lesson 3.3.1.2
3.3.1.2 Reaction mechanisms Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.1.2, Reaction mechanisms: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
Which symbol represents the unpaired electron on a free radical?
- Curly arrow
- Plus sign
- Single dot
- Asterisk
-
Which symbol shows the movement of an electron pair in organic mechanisms?
- Single dot
- Straight arrow
- Curly arrow
- Star symbol
-
Where must a curly arrow start to show the breaking of a covalent bond?
- From a lone pair
- From a radical
- From the bond
- From an atom
-
Which equation represents the initiation step in methane chlorination?
- Cl2 -> 2Cl•
- CH4 -> CH3• + H•
- CH3• + Cl• -> CH3Cl
- Cl• + CH4 -> HCl + CH3•
-
Which equation represents a propagation step in chlorinating methane?
- CH3• + Cl• -> CH3Cl
- CH4 + Cl• -> CH3• + HCl
- Cl2 -> 2Cl•
- Cl• + Cl• -> Cl2
-
What occurs during a termination step in free-radical substitution?
- Bonds undergo heterolytic fission
- A molecule splits
- Two radicals combine
- Radicals multiply
-
Where does a curly arrow start when a nucleophile attacks an electron-deficient carbon?
- A single electron
- A lone pair
- A positive charge
- A carbon atom
-
What is the defining role of an electrophile in an organic reaction mechanism?
- Electron pair acceptor
- Electron pair donor
- Proton donor
- Free radical initiator
-
How many curly arrows are needed to show the formation of a carbocation from an alkene and H+ ?
- One
- Two
- Three
- None
-
What is formed when a methyl radical reacts with a chlorine molecule in propagation?
- Dichloromethane and H•
- Methane and Cl2
- Chloromethane and Cl•
- Trichloromethane and Cl•
-
Which species is a nucleophile in the reaction of OH- with bromoethane?
- Bromoethane
- CH3CH2+
- OH-
- Br-
-
Which of these species is an electrophile?
- H+
- OH-
- NH3
- Br-
-
What species feature defines a free radical in an organic reaction mechanism?
- Positive charge
- Negative charge
- Unpaired electron
- Lone pair
-
What do standard curly arrows represent in organic reaction mechanisms?
- Atom transfer
- Single electron movement
- Proton movement
- Electron pair movement
-
Where must a curly arrow start to show covalent bond formation?
- Positive charge
- Lone pair or bond
- Carbon atom
- Free radical
-
What is the primary role of ultraviolet light in free-radical substitution reactions?
- Heterolytic bond fission
- Carbocation formation
- Radical termination
- Homolytic bond fission
-
Why does the chlorination of methane yield a mixture of different substituted products?
- Further substitution occurs
- Radicals cannot combine
- Reactions are reversible
- Methane is unreactive
-
Why does a termination step halt a free-radical chain reaction?
- UV light stops
- Radicals are removed
- Reactants are depleted
- Catalyst is deactivated
-
Where does the curly arrow point during heterolytic fission of a C-Br bond?
- Hydrogen atom
- Carbocation
- Bromine atom
- Carbon atom
-
In the mechanism of the reaction of an alkene with H-Br, which species is formed as the intermediate?
- A carbanion
- A carbocation
- A neutral alkane
- A free radical only
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