DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.d(iii)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.2.hl.TZ0.d(iii) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Explain | Question number | d(iii) | Adapted from | N/A |
d(iii).
[Maximum mark: 1]
19N.2.hl.TZ0.d(iii)
Propene is an important starting material for many products. The following shows some compounds which can be made from propene, C3H6.
Propene (C3H6) → C3H7Cl → C3H8O → C3H6O
Explain why the 1H NMR spectrum of C3H6O, produced in (d)(i), shows only one signal.
[1]
Markscheme
only one hydrogen environment
OR
methyl groups symmetrical «around carbonyl group» ✔
NOTE: Accept “all hydrogens belong to methyl groups «which are in identical positions»”.
