| Date | May 2011 | Marks available | 2 | Reference code | 11M.3.hl.TZ1.A2 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | State and explain | Question number | A2 | Adapted from | N/A |
Question
The \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectrum of X with molecular formula \({{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}{\text{O}}\) is shown below.
State and explain the splitting pattern you would expect in a high resolution spectrum for the peak at 1.1 ppm.
Markscheme
triplet;
next to a carbon atom that is attached to two hydrogen atoms;
Apply ECF.
CH3COCH3: singlet; no neighbouring H–atoms
CH2=CH–CH2OH: correct multiplicity and explanation for any peak.
Examiners report
Candidates understood this area well and scored most of the marks.
