Week 2: IR Spectroscopy

Question 1

What does IR stand for in IR Spectroscopy?

Answer 1

Infrared

Question 2

True or False: IR spectroscopy is primarily used to determine the molecular structure of a compound.

Answer 2

True

Question 3

Fill in the blank: IR spectroscopy is based on the absorption of ______ by molecules.

Answer 3

infrared radiation

Question 4

What type of molecular vibrations can be detected by IR spectroscopy?

Answer 4

Stretching and bending vibrations

Question 5

Which part of the electromagnetic spectrum does IR radiation fall into?

Answer 5

Between visible light and microwave

Question 6

What are the two main regions of an IR spectrum?

Answer 6

Near-infrared and far-infrared

Question 7

Multiple Choice: What is the main use of IR spectroscopy in chemical analysis?

Answer 7

Identifying functional groups

Question 8

True or False: IR spectra can provide information about the presence of specific chemical bonds.

Answer 8

True

Question 9

What is the typical range of wavenumbers (cm-1) used in IR spectroscopy?

Answer 9

4000 to 400 cm-1

Question 10

Short Answer: Name one application of IR spectroscopy in pharmaceuticals.

Answer 10

Quality control of drugs

Question 11

Fill in the blank: In IR spectroscopy, a peak in the spectrum corresponds to ______.

Answer 11

a specific bond vibration

Question 12

What is a common sample preparation technique for IR spectroscopy?

Answer 12

KBr pellet method

Question 13

Multiple Choice: Which of the following compounds would likely show strong IR absorption?

Answer 13

Alcohols

Question 14

True or False: IR spectroscopy can be used to analyze gases, liquids, and solids.

Answer 14

True

Question 15

What does a broad peak in an IR spectrum typically indicate?

Answer 15

Hydrogen bonding

Question 16

Short Answer: What is the purpose of using a reference spectrum in IR spectroscopy?

Answer 16

To compare and identify unknown samples

Question 17

Fill in the blank: The intensity of an IR absorption peak is related to the ______ of the bond.

Answer 17

strength

Question 18

What is the significance of the fingerprint region in an IR spectrum?

Answer 18

It helps in identifying specific compounds.

Question 19

Which type of molecular interaction can IR spectroscopy not effectively analyze?

Answer 19

Ionic interactions

Question 20

Multiple Choice: What does the term ‘transmittance’ refer to in IR spectroscopy?

Answer 20

The amount of light that passes through a sample

Question 21

Short Answer: Name one limitation of IR spectroscopy.

Answer 21

Limited ability to analyze mixtures

Question 22

True or False: IR spectroscopy can only be performed on pure substances.

Answer 22

False

Question 23

What is the main advantage of using Fourier Transform Infrared (FTIR) spectroscopy?

Answer 23

Faster data acquisition and better resolution

Question 24

Fill in the blank: The presence of a carbonyl group (C=O) can be identified by a peak around ______ cm-1.

Answer 24

1700

Question 25

What type of bond vibration is primarily observed in the region of 2800-3000 cm-1?

Answer 25

C-H stretching

Question 26

Multiple Choice: Which of the following is NOT typically analyzed using IR spectroscopy?

Answer 26

Metallic compounds