Question detail
Describe the role of ultraviolet light in the chlorination of alkanes.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Alkanes
Question
Describe the role of ultraviolet light in the chlorination of alkanes.
Answer
Ultraviolet light provides the energy needed to initiate the chlorination process by breaking the Cl-Cl bond, generating chlorine radicals that can react with alkanes.
Explanation
This answer effectively explains the initiation step of the chlorination process, highlighting the importance of ultraviolet light in radical formation. The question assesses knowledge of free-radical substitution mechanisms in organic chemistry.
Common mistake
Misunderstanding Catalytic Converters
Students often think that catalytic converters completely eliminate pollutants from exhaust gases.
Catalytic converters reduce pollutants by converting harmful gases into less harmful substances through chemical reactions. The main reactions involve converting carbon monoxide (CO) into carbon dioxide (CO2) and nitrogen oxides (NOx) into nitrogen (N2) and oxygen (O2). To explain this, we can use the following relationships: 1. **Rule**: The reactions in catalytic converters involve oxidation and reduction. 2. **Substitution**: For example, 2CO + O2 → 2CO2 (oxidation of carbon monoxide) and 2NO → N2 + O2 (reduction of nitrogen oxides). 3. **Working**: The catalytic converter uses catalysts (like platinum, palladium, and rhodium) to facilitate these reactions at lower temperatures. 4. **Answer**: The result is a significant reduction in harmful emissions, but not a complete elimination. 5. **Units/Conclusion**: Therefore, while catalytic converters greatly reduce pollutants, they do not remove them entirely, leading to cleaner exhaust gases.
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