(a)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(b)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(c)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(d)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(e)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(f)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
(g)
Interpretation:
The active or inactive state of the molecule
Concept introduction:
A molecule is active in the infrared spectrum if it has the net dipole moment.
The vibrations are classified into the two categories.
- The stretching vibration (In this vibration the interatomic distance is changes continuously along with bond axis).
- The bending vibration (In the vibration the change in the angle between the two bonds take place).
The bending vibrations are further classified into four categories.
- The wagging vibration.
- The twisting vibration.
- The rocking vibration.
- The scissoring vibration.
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Chapter 16 Solutions
Principles of Instrumental Analysis
- Which of the following statements accurately describes the characteristic molecular vibrations of IR spectroscopy?A.)The stretch frequencies are lower than the frequencies of corresponding bending. B.) The stretch frequencies appear mainly in the fingerprint region. C.)Triple bonds have lower stretch frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds. D.) Hydrogen bonds have higher stretch frequencies than larger heavy atoms.arrow_forwardPlease draw the structure of dopamine and list all the wavenumbers you would expect in the IR spectrum of dopamine.arrow_forwardPlease identify and assign the major stretching vibrations for acetyl eugenol.arrow_forward
- Wavenumbers of prominent peaks/ signal in the spectrum Functional groups present in the unknown (Discussion):arrow_forwardWhat is the unknown of this IR spectrum?arrow_forwardExplain why the protons that can exhibit hydrogen bonding exhibit extremely variable absorption positions over a wide range ?arrow_forward
- The IR spectra of two isomers are given below. Identify which IR spectra belong to isopropylbenzene and propylbenzene, respectively. How we decide them?arrow_forwardChoose the molecule to which this IR spectrum corresponds.arrow_forwardThere are three carbon–oxygen bonds in methyl acetate. a. What are their relative bond lengths? b. What are the relative infrared (IR) stretching frequencies of these bonds?arrow_forward
- Which of the following molecules is responsible for this IR spectrum?arrow_forwardIn which of the following ranges of the IR region of the spectrum would not the following molecule absorb energy? a. 3400 - 3650 cm-1 b. 2500 - 3100 cm-1 c. 2850 - 2960 cm-1 d. 1050 - 1150 cm-1arrow_forwardDescribe the atom bonding pattern and type of vibrational mode giving rise to each of the key IR peaksarrow_forward
- Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,