DP Chemistry (last assessment 2024)
Question 21M.2.sl.TZ2.e(i)
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.sl.TZ2.e(i) |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | e(i) | Adapted from | N/A |
e(i).
[Maximum mark: 2]
21M.2.sl.TZ2.e(i)
Organic chemistry can be used to synthesize a variety of products.
Combustion analysis of an unknown organic compound indicated that it contained only carbon, hydrogen and oxygen.
Deduce two features of this molecule that can be obtained from the mass spectrum. Use section 28 of the data booklet.
NIST Mass Spectrometry Data Center Collection © 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
[2]
Markscheme
m/z 58:
molar/«relative» molecular mass/weight/Mr «is 58 g mol−1/58» ✓
m/z 43:
«loses» methyl/CH3 «fragment»
OR
COCH3+ «fragment» ✓
Do not penalize missing charge on the fragments.
Accept molecular ion «peak»/ CH3COCH3+/C3H6O+.
Accept any C2H3O+ fragment/ CH3CH2CH2+/C3H7+.