CAIE A-Level Chemistry AS 22.2.5 The Number of Carbon Atoms N in a Compound Questions

Practise CAIE 9701 M+1 isotope calculations using the carbon-13 contribution to determine carbon count or predict a peak intensity.

Exam points

substitute both relative peak abundances into n = 100 × [M+1] / (1.1 × M)
keep M and M+1 peak intensities in the same abundance scale before calculating
rearrange the same relationship to predict the M+1 abundance when carbon count and M are given

[Maximum number: 1]

In the mass spectrum of compound J , the ratio of the height of the M+1 ion peak to the height of the M+ ion peak is 4:91.

Compound J forms a carboxylic acid when heated with acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ .
What is compound J?

butanal

butanone

propan-1-ol

propanenitrile

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CAIE A-Level Chemistry AS 22.2.5 The Number of Carbon Atoms N in a Compound Questions question 1