Question detail
Which of the following statements best describes the difference between nucleophilic substitution and elimination reactions in halogenoalkanes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Halogenoalkanes
Question
- A. Nucleophilic substitution replaces a halogen with a nucleophile, while elimination removes a halogen and a hydrogen to form a double bond.
- B. Nucleophilic substitution requires heat, while elimination occurs at room temperature.
- C. Nucleophilic substitution produces alkenes, while elimination produces alcohols.
- D. Nucleophilic substitution occurs only with primary halogenoalkanes, while elimination occurs only with tertiary halogenoalkanes.
Answer
Nucleophilic substitution replaces a halogen with a nucleophile, while elimination removes a halogen and a hydrogen to form a double bond.
Explanation
Nucleophilic substitution involves the replacement of a halogen atom with a nucleophile, while elimination reactions involve the removal of a halogen and a hydrogen atom, resulting in the formation of a double bond. This key difference determines the products formed in each reaction type.
Common mistake
Comparing Reaction Rates of Halogenoalkanes
Students often confuse the hydrolysis rates of different halogenoalkanes, thinking that all halogenoalkanes react at the same rate regardless of their structure.
To fix this, students should understand that the reaction rate in hydrolysis depends on the strength of the carbon-halogen bond. For example, primary halogenoalkanes react slower than tertiary ones due to bond enthalpy differences. Recognizing that stronger bonds require more energy to break will help in comparing reaction rates accurately.
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