Lesson 6D.2
6D.2 Nucleophilic substitution and reactivity trends Quiz: Pearson Edexcel Chemistry, Unit 6
20 questions
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Lesson 6D.2, Nucleophilic substitution and reactivity trends: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 6: Organic Chemistry I, written with Revision Ninja.
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The 20 questions
-
Which halogenoalkane reacts fastest during hydrolysis with aqueous silver nitrate?
- 2-chloro-2-methylpropane
- 1-iodobutane
- 2-iodo-2-methylpropane
- 1-chlorobutane
-
Why do iodoalkanes react faster in nucleophilic substitution than chloroalkanes?
- Smaller atomic radius
- Lower bond enthalpy
- Higher polarity
- Greater bond enthalpy
-
Approximately what is the mean bond enthalpy of the C-Cl bond, in kJ mol-1?
- 340
- 240
- 280
- 410
-
Which mechanism describes the reaction of a primary halogenoalkane with aqueous hydroxide?
- SN1 mechanism
- E1 mechanism
- E2 mechanism
- SN2 mechanism
-
Where does the first curly arrow originate in an SN2 nucleophilic attack?
- OH- lone pair
- Bromine nucleus
- C-H bond
- C-Br bond
-
What main factor allows primary halogenoalkanes to undergo SN2 reactions faster than tertiary ones?
- Stronger C-X polarity
- Higher bond enthalpy
- Less steric hindrance
- Greater carbocation stability
-
Which factor explains why fluoroalkanes are unreactive in nucleophilic substitution reactions?
- Low electronegativity
- High steric hindrance
- Low bond polarity
- High bond enthalpy
-
Which expression represents the relative rate of reaction when precipitate formation time is t?
- 1/t
- log(t)
- t
- t squared
-
Which species acts as the nucleophile in the reaction between 1-bromobutane and ammonia?
- Butyl cation
- Ammonia molecule
- Hydrogen ion
- Bromide ion
-
Why does halogenoalkane reaction with ammonia produce multiple amines?
- Ammonia is a catalyst
- Product is nucleophilic
- Reaction is reversible
- Carbocations rearrange
-
Why do tertiary halogenoalkanes undergo SN1 hydrolysis faster than primary ones?
- Higher bond enthalpy
- Less steric hindrance
- Carbocation stability
- Lower bond polarity
-
What is the correct order of increasing rate of hydrolysis for chloro-, bromo-, and iodoethane?
- Bromo, chloro, iodo
- Iodo, bromo, chloro
- Chloro, iodo, bromo
- Chloro, bromo, iodo
-
Which species or state contains both partially formed and partially broken bonds in SN2?
- Free radical
- Transition state
- Carbocation intermediate
- Carbanion intermediate
-
Which halogenoalkane reacts fastest with aqueous silver nitrate in ethanol at room temperature?
- 2-chlorobutane
- 2-iodo-2-methylpropane
- 1-iodobutane
- 1-chlorobutane
-
Which factor primarily determines the relative rate of nucleophilic substitution in halogenoalkanes?
- Carbon electronegativity
- C-X bond enthalpy
- C-X bond polarity
- Halogen ionic radius
-
Which species acts as the leaving group when a halogenoalkane undergoes nucleophilic substitution?
- Halogen atom
- Carbocation
- Hydrogen ion
- Halide ion
-
Which type of halogenoalkane is most likely to react via an SN1 mechanism?
- Primary
- Methyl
- Secondary
- Tertiary
-
Which bond enthalpy values are in the correct order from strongest to weakest?
- C-Br, C-Cl, C-I
- C-I, C-Cl, C-Br
- C-I, C-Br, C-Cl
- C-Cl, C-Br, C-I
-
If a reaction takes 25 seconds compared to 50 seconds for another, how much faster is it?
- Three times faster
- Twice as fast
- Four times faster
- Half as fast
-
What is the role of ethanol when testing halogenoalkanes with silver nitrate solution?
- Precipitating agent
- Catalyst
- Nucleophile
- Co-solvent
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