Question detail
Explain the role of hydroxide ions in nucleophilic substitution reactions involving halogenoalkanes.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
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exam_style
Style
Topic
Halogenoalkanes
Question
Explain the role of hydroxide ions in nucleophilic substitution reactions involving halogenoalkanes.
Answer
Hydroxide ions (OH-) act as nucleophiles in nucleophilic substitution reactions. They attack the carbon atom bonded to the halogen, displacing the halogen atom and forming an alcohol. This occurs because the carbon-halogen bond is polar, making the carbon atom susceptible to attack by the nucleophile.
Explanation
This answer is strong because it clearly identifies the role of hydroxide ions as nucleophiles and explains the mechanism of the reaction. The question tests the understanding of nucleophilic substitution and the behavior of hydroxide ions in this context.
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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