Structure determination: one contradiction falsifies a structure

Year 12 Chemistry, Module 8 · propose a candidate and the bench tests it against every observation — molecular ion, fragments, IR bands present and absent, 1H and 13C environments. Spectra are idealised schematics.
1 · Mass and formula 2 · Functional groups (IR) 3 · 13C environments 4 · 1H detail 5 · Assemble and cross-check

Unknown

a tick marks a solved unknown

Mass spectrum m/z

Infrared cm−1, transmittance

1H NMR δ / ppm

13C NMR δ / ppm

Candidate structures

select one to propose it

Evidence checklist

select a row to read the reasoning