Unit 6: Reactivity 3: What Are the Mechanisms of Chemical Change?
Topic 6.4: Electron-Pair Sharing Reactions Questions
Practice 20 exam-style questions for IB Chemistry Topic 6.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State1 mark
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State the conditions needed for the hydrolysis of a halogenoalkane to an alcohol.
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Identify the electrophile responsible for the nitration of benzene.
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State the reagent and condition used to distinguish an alkene from an alkane.
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Explain why 2-bromopropane is the major product.
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Ethene, C₂H₄, reacts with bromine, Br₂, at room temperature.
Predict the organic product, state the type of reaction, and outline, with reference to electron-pair movement, why ethene readily undergoes this reaction. [3]
Predict the organic product, state the type of reaction, and outline, with reference to electron-pair movement, why ethene readily undergoes this reaction. [3]
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2-bromopropane, CH₃CHBrCH₃, is heated with warm aqueous potassium hydroxide.
State the type of reaction taking place, identify the organic product, and explain why an iodoalkane would react faster than this bromoalkane. [3]
State the type of reaction taking place, identify the organic product, and explain why an iodoalkane would react faster than this bromoalkane. [3]
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State the type of reaction and the product when ethene reacts with bromine, and explain what is observed.
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Explain why alkenes undergo addition reactions readily but alkanes do not.
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State the product when propene reacts with hydrogen bromide, and explain why two products are possible.
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State the reagent and conditions for converting ethene into ethanol, and name the type of reaction.
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State the reagent and conditions for converting bromoethane into ethanol, name the mechanism, and give the organic product.
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Define a nucleophile and explain why the hydroxide ion attacks the carbon atom of the C-Br bond in bromoethane.
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Explain why iodoethane undergoes nucleophilic substitution faster than chloroethane.
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Describe the mechanism of the reaction between bromoethane and the hydroxide ion, naming the bond that breaks and the bond that forms.
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Two unlabelled samples are known to be propane and propene.
Describe a simple chemical test that distinguishes them, stating the observation for each, and explain why only one reacts. [3]
Describe a simple chemical test that distinguishes them, stating the observation for each, and explain why only one reacts. [3]
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Deduce the organic product and name the mechanism.
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Explain why the nitration of benzene requires a catalyst of concentrated sulfuric acid.
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What is the major product when hydrogen bromide adds to propene?
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Outline why alkenes are more reactive than alkanes.
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Bromoethane, CH₃CH₂Br, is warmed with aqueous sodium hydroxide and undergoes nucleophilic substitution.
Use curly arrows to describe the movement of electron pairs in this reaction, and identify the leaving group. [3]
Use curly arrows to describe the movement of electron pairs in this reaction, and identify the leaving group. [3]
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