DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ1.a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.sl.TZ1.a |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.3.sl.TZ1.a
Liquid-crystal displays (LCDs) have many uses.
A molecule which acts as a thermotropic liquid crystal is shown.
State the name of the functional group which allows the molecule to be responsive to applied electric fields.
[1]
Markscheme
nitrile [✔]
Note: Accept “cyano".
Examiners report
A few students correctly named the nitrile group as being the one responsible for the polarity of the liquid crystal molecule.
