Use fragmentation evidence to support structural identification.

In the subtopic Test-tube reactions and mass spectrometry, this AQA A-Level Chemistry 7405 learning objective focuses on use fragmentation evidence to support structural identification. It belongs to Organic analysis, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include fragmentation. Fragmentation. means the process in mass spectrometry where molecular ions break into smaller ions, providing evidence for structural identification Avoid the mistake of students often misinterpret the fragmentation patterns in mass spectra, confusing the peaks with the molecular ion peak; instead, to fix this, students should focus on identifying the highest m/z value peak as the molecular ion peak and analyze the lower m/z peaks as fragments that provide information about the structure For exam answers, when analyzing mass spectra, pay close attention to the fragmentation patterns of the molecular ion peaks