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Haloalkanes

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Question 5

The halon bromochlorodifluoromethane (CF2ClBr\text{CF}_2\text{ClBr}CF2​ClBr), once widely used in aviation fire-suppression systems, can migrate to the stratosphere where it undergoes photolysis by absorbing ultraviolet radiation, contributing to ozone depletion.

Which equation represents the initiation step that occurs when a molecule of CF2ClBr\text{CF}_2\text{ClBr}CF2​ClBr absorbs ultraviolet radiation?

A

CF2ClBr→∙CF2Br+∙Cl\text{CF}_2\text{ClBr} \rightarrow \bullet\text{CF}_2\text{Br} + \bullet\text{Cl}CF2​ClBr→∙CF2​Br+∙Cl

B

CF2ClBr→∙CF2Cl+∙Br\text{CF}_2\text{ClBr} \rightarrow \bullet\text{CF}_2\text{Cl} + \bullet\text{Br}CF2​ClBr→∙CF2​Cl+∙Br

C

CF2ClBr→∙CFClBr+∙F\text{CF}_2\text{ClBr} \rightarrow \bullet\text{CFClBr} + \bullet\text{F}CF2​ClBr→∙CFClBr+∙F

D

CF2ClBr→CF2Cl++Br−\text{CF}_2\text{ClBr} \rightarrow \text{CF}_2\text{Cl}^+ + \text{Br}^-CF2​ClBr→CF2​Cl++Br−

Markscheme

Haloalkanes Questions

  1. A Level
  2. /Chemistry
  3. /Haloalkanes

15 exam-style questions on OCR A A Level Chemistry Haloalkanes. Each one has a worked solution and a mark scheme showing where the marks go.

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