Lesson 3.3.6.3
3.3.6.3 Infrared spectroscopy Quiz: AQA Chemistry, Unit 3
20 questions
In partnership with Revision Ninja
Lesson 3.3.6.3, Infrared spectroscopy: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
What unit is used for the position of absorptions in an infrared spectrum?
- kJ mol⁻¹
- nm
- cm⁻¹
- Hz
-
Which bond gives a strong absorption around 1680-1750 cm-1?
- C-H
- O-H in alcohols
- N-H in amines
- C=O
-
Which wavenumber range indicates the presence of an alcohol O-H group?
- 3200–3550 cm⁻¹
- 1680–1750 cm⁻¹
- 2500–3000 cm⁻¹
- 1000–1300 cm⁻¹
-
What is the primary purpose of the fingerprint region in an infrared spectrum?
- Determining molecular mass
- Measuring concentration
- Identifying a compound
- Finding bond lengths
-
Which atmospheric gas absorbs infrared radiation and acts as a greenhouse gas?
- Carbon dioxide
- Nitrogen
- Argon
- Oxygen
-
Which functional group causes a broad absorption at 2500–3000 cm⁻¹ and C=O peak at 1700 cm⁻¹?
- Ester
- Alcohol
- Carboxylic acid
- Aldehyde
-
Which absorption feature distinguishes ethanol from ethanal in an infrared spectrum?
- C-H peak
- Broad O-H peak
- Sharp C=O peak
- C-C peak
-
Which wavenumber range is characteristic of a C=O stretch?
- 3200-3550 cm-1
- 1620-1680 cm-1
- 2850-3300 cm-1
- 1680-1750 cm-1
-
Which bond absorption is present in almost all organic compounds between 2850 and 3300 cm⁻¹?
- C=O
- C-C
- C-H
- O-H
-
Which infrared absorption peak indicates water contamination in an organic liquid?
- Sharp peak at 2250 cm⁻¹
- Broad peak at 2500–3300 cm⁻¹
- Sharp peak at 1700 cm⁻¹
- Broad peak at 3200–3550 cm⁻¹
-
A spectrum shows an absorption at about 1650 cm-1 but none at 1700-1750 cm-1. Which bond is most likely present?
- O-H
- C=O
- C-O
- C=C
-
How does an amine N-H infrared absorption appear compared to an alcohol O-H absorption?
- Higher wavenumber
- Sharper
- Broader
- Lower wavenumber
-
An organic isomer shows both C=O and a very broad 2500–3000 cm⁻¹ absorption. Name the functional group.
- Aldehyde
- Ketone
- Carboxylic acid
- Ester
-
What interaction occurs between atmospheric carbon dioxide and infrared radiation to trap heat?
- Emission of ultraviolet
- Reflection of radiation
- Absorption of radiation
- Refraction of light
-
Why do nitrogen and oxygen molecules fail to absorb infrared radiation?
- High molecular mass
- Unreactive nature
- Low boiling point
- No dipole change
-
A compound shows a strong absorption at 1715 cm-1 and no broad O-H absorption, with formula C3H6O. Which compound is most likely?
- Propenoic acid
- Propan-1-ol
- Propanone
- Propene
-
Which compound shows a C=O absorption near 1735 cm-1 and no broad O-H absorption?
- Ethanoic acid
- Ethyl ethanoate
- Ethanol
- Ethanamine
-
What reference source is used alongside infrared spectra to identify functional group absorptions?
- Mass spectrum
- Periodic table
- Reactivity series
- Data sheet
-
Which wavenumber range is characteristic of a C-O single bond stretch?
- 1620-1680 cm-1
- 2850-3300 cm-1
- 3200-3550 cm-1
- 1000-1300 cm-1
-
An infrared spectrum shows a strong absorption at 1700-1750 cm-1 and a band at 1000-1300 cm-1, with no broad O-H band. Which functional group is most likely?
- Alkene
- Ester
- Amine
- Alcohol
Related quizzes
- Nomenclature Quiz · 3.3.1.1 · 20 questions
- Reaction mechanisms Quiz · 3.3.1.2 · 20 questions
- Isomerism Quiz · 3.3.1.3 · 20 questions
- Fractional distillation of crude oil Quiz · 3.3.2.1 · 20 questions
- Modification of alkanes by cracking Quiz · 3.3.2.2 · 20 questions
- Combustion of alkanes Quiz · 3.3.2.3 · 20 questions
- Chlorination of alkanes Quiz · 3.3.2.4 · 20 questions
- Nucleophilic substitution Quiz · 3.3.3.1 · 20 questions
- Halogenoalkanes: Elimination Quiz · 3.3.3.2 · 20 questions
- Bonding Quiz · 3.3.10.1 · 20 questions