DP Chemistry (first assessment 2025)
Question 19M.1A.HL.TZ2.39
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.HL.TZ2.39 |
| Level | HL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 39 | Adapted from | N/A |
39.
[Maximum mark: 1]
19M.1A.HL.TZ2.39
What can be deduced from the infrared (IR) spectrum of a compound?
A. Number of hydrogens
B. Number of hydrogen environments
C. Bonds present
D. Molar mass
[1]
Markscheme
C
Examiners report
82 % of the candidates identified the bonds present as the information that can be deduced from an infrared spectrum. The most commonly chosen distractor was B (the number of hydrogen environments).
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.9—Infrared (IR) spectra can be used to identify the type of bond present in a molecule. Interpret the functional group region of an IR spectrum, using a table of characteristic frequencies (wavenumber/cm–1).