IB skill practice

Interpret infrared and mass spectral data

Paper 1, Paper 2 5 marks Difficulty 5

Interpret IR or mass peak

An IR/mass spectrum in a university-style problem set shows molecular ion at m/z 72. State the structural interpretation. Use the labelled diagram or spectrum before giving the answer. Enter the answer and choose the interpretation that matches the HL chemistry evidence.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.