Question detail
Describe how hydroxide ions can act as both a nucleophile and a base in elimination reactions of halogenoalkanes.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
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Topic
Halogenoalkanes
Question
Describe how hydroxide ions can act as both a nucleophile and a base in elimination reactions of halogenoalkanes.
Answer
In elimination reactions, hydroxide ions can act as a base by abstracting a proton from a β-hydrogen atom, leading to the formation of a double bond and the elimination of the halogen. Simultaneously, they can also act as nucleophiles by attacking the carbon atom bonded to the halogen, resulting in substitution. This dual role is influenced by the reaction conditions.
Explanation
This answer effectively outlines the dual role of hydroxide ions in elimination reactions, demonstrating an understanding of both nucleophilic and basic behavior. The question assesses the ability to connect concepts of nucleophilicity and basicity in organic reactions.
Common mistake
Misunderstanding Hydroxide Ion Roles
Students often confuse the roles of hydroxide ions as both nucleophiles and bases, failing to explain how they can act in both capacities depending on the reaction conditions.
To clarify, hydroxide ions (OH-) can act as nucleophiles in nucleophilic substitution reactions by attacking electrophilic carbon atoms, and as bases in elimination reactions by abstracting protons. Always specify the context of the reaction to determine their role. For example, in a reaction with a halogenoalkane, state that OH- acts as a nucleophile when substituting the halogen and as a base when facilitating elimination.
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