Learning objective
Explain the role of hydroxide ions as nucleophile and base.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Halogenoalkanes
Subtopic
Elimination
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Quick explanation
Explain the role of hydroxide ions as nucleophile and base
- This point belongs to Halogenoalkanes, especially Elimination.
- You need to be able to explain the role of hydroxide ions as nucleophile and base.
- The key ideas to know are base.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Elimination to exam-style questions, flashcards, and revision notes for Halogenoalkanes.
Quick student answer
What is the primary role of hydroxide ions (OH⁻) in the elimination reaction of halogenoalkanes?
Direct answer
Hydroxide ions act as a base to remove a proton from the β-carbon during the elimination reaction.
Key terms
- Nucleophile: A species that donates an electron pair to form a new covalent bond.
- Base: A substance that can accept protons (H⁺ ions) in a chemical reaction.
Common trap
Confusing nucleophiles with bases: Remember that nucleophiles donate electron pairs, while bases accept protons.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Explain why halogenoalkanes contain polar bonds.
Nucleophilic substitution
- Outline nucleophilic substitution mechanisms with OH-, CN- and NH3.
Nucleophilic substitution
- Explain how carbon-halogen bond enthalpy affects reaction rate.
Nucleophilic substitution
- Use test-tube hydrolysis evidence to compare reaction rates.
Nucleophilic substitution
- Outline elimination mechanisms for halogenoalkanes.
Elimination