This is an MCQ-based quiz for GRE on the topic of Infrared Spectroscopy.
The measurement of the interaction of infrared radiation with matter by absorption, emission, or reflection. It is used to study and identify chemical substances or functional groups in solid, liquid, or gaseous forms.
Which of the following statements is true concerning infrared spectroscopy?
Which of the following statements is true concerning infrared (IR) spectroscopy?
In IR spectroscopy, the vibration between atoms is caused by which of the following?
Which of the following functional groups exhibits the highest frequency in an infrared (IR) spectrum?
An alcohol group in a compound would result in a broad dip around what part of the infrared (IR) spectrum?
An unknown compound is analyzed using infrared spectroscopy. A strong, sharp peak is observed at a frequency of 1750cm-1. What functional group is present?
Approximately where would a carbonyl peak be found on an IR spectrum?
An IR spectrum reading is taken before and after treating acetone with the reducing agent NaBH4. What IR peak readings would be seen for the reactant acetone and for the predicted product?
Acetone: 1750cm−1, Product: 1000cm−1
Acetone: 1000cm−1, Product: 3300cm−1
Acetone: 1750cm−1, Product: 3300cm−1
Acetone: 3300cm−1, Product: 3300cm−1
Acetone: 3300cm−1, Product: 1750cm−1
After taking an IR spectrum of a sample synthesized in the lab, you have 3 IR peaks. Peak A has a 70 transmittance, peak B has a 50 transmittance, and peak C has a 5 transmittance. Which peak has the greatest absorbance?
All the peaks have the same transmittance
Peaks A and B
What is the absorbance of an IR peak with a 25% transmittance?