Question detail
In a hydrolysis reaction of halogenoalkanes, what evidence would indicate a faster reaction rate?
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. The time taken for the solution to become cloudy.
- B. A change in color of the solution.
- C. The formation of a precipitate.
- D. The temperature increase of the solution.
Answer
The time taken for the solution to become cloudy.
Explanation
The correct option is The time taken for the solution to become cloudy.. The time taken for the solution to become cloudy. is the best answer because it directly supports the AQA A-Level Chemistry objective to use test-tube hydrolysis evidence to compare reaction rates. This reasoning is anchored to Nucleophilic substitution in Halogenoalkanes, and it separates test-tube from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
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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