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.

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

[Maximum number: 1]

The mass spectrum of compound X has M, M+1 and M+2 peaks. Other peaks are also present.
Peak M is the molecular ion peak, $M^{+}$ . Peak M has a relative abundance fifteen times that of peak M+1.

Peaks M and M+2 are of equal height.
What could be compound X ?

1-chloro-2,2-dimethylpentane

2-chloro-3-methylpentane

2-bromo-2-methylhexane

3-bromo-2,2-dimethylbutane

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