CAIE A-Level Chemistry 22.2.6 Detecting Chlorine and Bromine
Practise using molecular-ion and M+2 peak ratios to identify chlorine or bromine atoms in a compound.
- 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
22.2.6—The presence of bromine and chlorine atoms question 1
Compounds P and Q are structural isomers.
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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