DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.12
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.12 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 12 | Adapted from | N/A |
12.
[Maximum mark: 1]
19M.1A.SL.TZ2.12
Which compound has hydrogen bonds between its molecules?
A. CH4
B. CH4O
C. CH3Cl
D. CH2O
[1]
Markscheme
B
Examiners report
72 % of the candidates identified CH4O as having hydrogen bonds between its molecules. The most commonly chosen distractor was CH2O, the only other option containing oxygen.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.8—The nature of the force that exists between molecules is determined by the size and polarity of the molecules. Intermolecular forces include London (dispersion), dipole-induced dipole, dipole–dipole and hydrogen bonding. Deduce the types of intermolecular force present from the structural features of covalent molecules.