Question detail
In a test-tube hydrolysis experiment comparing the reaction rates of different halogenoalkanes, which halogenoalkane would you expect to react the fastest?
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. 1-bromobutane
- B. 1-chlorobutane
- C. 2-bromobutane
- D. 2-chlorobutane
Answer
1-bromobutane
Explanation
1-bromobutane is expected to react faster than 1-chlorobutane due to the weaker carbon-bromine bond compared to the carbon-chlorine bond. This lower bond enthalpy allows for easier nucleophilic substitution, resulting in a faster reaction rate.
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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