DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ2.7c.iii
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.sl.TZ2.7c.iii |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | c.iii | Adapted from | N/A |
c.iii.
[Maximum mark: 2]
18M.2.sl.TZ2.7c.iii
The structure of an organic molecule can help predict the type of reaction it can undergo.
Improvements in instrumentation have made identification of organic compounds routine.
The empirical formula of an unknown compound containing a phenyl group was found to be C4H4O. The molecular ion peak in its mass spectrum appears at m/z = 136.
(c.iii)
Deduce full structural formulas of two possible isomers of the unknown compound, both of which are esters.
[2]
Markscheme
Any two of:
OR C6H5COOCH3
OR CH3COOC6H5
OR HCOOCH2C6H5
Do not penalize use of Kekule structures for the phenyl group.
Accept the following structures:
Award [1 max] for two correct aliphatic/linear esters with the molecular formula C8H8O2.
[2 marks]
