DP Chemistry (last assessment 2024)
Question 22M.1.hl.TZ1.26
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1.hl.TZ1.26 |
| Level | hl | Paper | 1 | Time zone | TZ1 |
| Command term | Apply | Question number | 26 | Adapted from | N/A |
26.
[Maximum mark: 1]
22M.1.hl.TZ1.26
Which statement explains the Lewis acid–base nature of the chloride ion in this reaction?
C2H5+ + Cl– → C2H5Cl
A. Lewis base because it donates a pair of electrons
B. Lewis base because it accepts a pair of electrons
C. Lewis acid because it donates a pair of electrons
D. Lewis acid because it accepts a pair of electrons
[1]
Markscheme
A
Examiners report
A discriminating question in which high scoring candidates had much greater success in explaining the Lewis acid-base nature of the chloride ion in the given reaction. The next two common incorrect answers were B and D showing a lack of understanding of the Lewis acid-base concept.