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CAIE A-Level Chemistry AS 22.2.6 The Presence of Bromine and Chlorine Atoms Questions

Practise CAIE 9701 isotope-cluster analysis by using M:M+2 ratios to identify chlorine or bromine and assign the corresponding ions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • recognise one chlorine atom from an M:M+2 pattern near 3:1 due to 35Cl and 37Cl
  • recognise one bromine atom from approximately equal M and M+2 peaks due to 79Br and 81Br
  • assign both isotope-containing ion structures and adjust ratios when more than one halogen is present

CAIE A-Level Chemistry AS 22.2.6 The Presence of Bromine and Chlorine Atoms Questions question 1

[Maximum number: 2]

Compounds P and Q are structural isomers.

Fig. 4.1

Fig. 4.1

The mass spectrum of R shows peaks at m / e=150 and m / e=152.

Suggest structures for the ions responsible for these peaks.

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