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Haloalkanes

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Question 3

Halon-1211 (CF2ClBr\text{CF}_2\text{ClBr}CF2​ClBr) is a bromochlorodifluoromethane compound historically used in aviation fire suppression systems. Like CFCs, when it reaches the stratosphere, it absorbs ultraviolet radiation and undergoes homolytic fission, initiating the catalytic destruction of ozone.

Which initiation step occurs preferentially when CF2ClBr\text{CF}_2\text{ClBr}CF2​ClBr absorbs ultraviolet radiation?

A

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

B

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

C

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

D

CF2ClBr→∙ClBr+∙CF2\text{CF}_2\text{ClBr} \rightarrow \bullet\text{ClBr} + \bullet\text{CF}_2CF2​ClBr→∙ClBr+∙CF2​

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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