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Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?
- a)Stretching frequencies appear mostly in the fingerprint region.
- b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.
- c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
- d)Stretching frequencies are lower than corresponding bending frequencies.
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statements accurately describes the molecular v...
Statement: Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
Explanation:
1. Introduction to Infrared (IR) Spectroscopy:
IR spectroscopy is a technique used to study the vibrational modes of molecules. When a molecule absorbs infrared radiation, its bonds vibrate, resulting in characteristic absorption bands in the IR spectrum. These absorption bands provide information about the functional groups present in the molecule and can be used for identification and analysis.
2. Molecular Vibrations:
Molecular vibrations involve the stretching and bending of chemical bonds. Stretching vibrations occur when a bond is elongated or shortened along the bond axis, while bending vibrations involve the change in bond angle.
3. Stretching Frequencies in IR Spectroscopy:
Stretching frequencies in IR spectroscopy are typically higher than bending frequencies. The stretching vibrations involve stronger and stiffer bonds, leading to higher frequencies. The stretching frequencies are influenced by several factors, including bond strength, bond length, and the masses of the atoms involved.
4. Bonds to Hydrogen:
Bonds to hydrogen are generally stronger and stiffer compared to bonds involving heavier atoms. This is because hydrogen atoms are light, and the bond between hydrogen and another atom is typically stronger. Therefore, bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
5. Example:
Let's consider an example of the stretching frequencies of C-H, C-C, and C-O bonds. In general, C-H bonds have higher stretching frequencies compared to C-C and C-O bonds. This is because the C-H bond is stronger and stiffer due to the smaller mass of hydrogen compared to carbon and oxygen.
6. Conclusion:
Based on the above explanation, statement C accurately describes the molecular vibrations characteristic of IR spectroscopy. Bonds to hydrogen have higher stretching frequencies than those to heavier atoms. This knowledge is important in interpreting IR spectra and identifying functional groups in organic molecules.
Explanation:
1. Introduction to Infrared (IR) Spectroscopy:
IR spectroscopy is a technique used to study the vibrational modes of molecules. When a molecule absorbs infrared radiation, its bonds vibrate, resulting in characteristic absorption bands in the IR spectrum. These absorption bands provide information about the functional groups present in the molecule and can be used for identification and analysis.
2. Molecular Vibrations:
Molecular vibrations involve the stretching and bending of chemical bonds. Stretching vibrations occur when a bond is elongated or shortened along the bond axis, while bending vibrations involve the change in bond angle.
3. Stretching Frequencies in IR Spectroscopy:
Stretching frequencies in IR spectroscopy are typically higher than bending frequencies. The stretching vibrations involve stronger and stiffer bonds, leading to higher frequencies. The stretching frequencies are influenced by several factors, including bond strength, bond length, and the masses of the atoms involved.
4. Bonds to Hydrogen:
Bonds to hydrogen are generally stronger and stiffer compared to bonds involving heavier atoms. This is because hydrogen atoms are light, and the bond between hydrogen and another atom is typically stronger. Therefore, bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
5. Example:
Let's consider an example of the stretching frequencies of C-H, C-C, and C-O bonds. In general, C-H bonds have higher stretching frequencies compared to C-C and C-O bonds. This is because the C-H bond is stronger and stiffer due to the smaller mass of hydrogen compared to carbon and oxygen.
6. Conclusion:
Based on the above explanation, statement C accurately describes the molecular vibrations characteristic of IR spectroscopy. Bonds to hydrogen have higher stretching frequencies than those to heavier atoms. This knowledge is important in interpreting IR spectra and identifying functional groups in organic molecules.
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Community Answer
Which of the following statements accurately describes the molecular v...
- Stretching vibrations occur at higher frequencies than bending vibrations. Generally, bonds more easily bend than stretch or compress.
- The fingerprint region is in the 1450 to 600 cm-1 region, and most of the bending frequencies appear in that region. Absorption in the diagnostic 4000 to 1450 cm-1 region are usually due to stretching vibrations.
- Bond order and the types of atoms joined by the bond are the two most important factors in determining where a chemical bond will absorb.
- The higher the bond order, the higher the frequency needed to stretch. Triple bonds have higher stretching frequencies than corresponding double bonds, especially bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
- Therefore, the correct answer is that bonds to hydrogen have higher stretching frequencies than those to heavier atoms.
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Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer? for MCAT 2024 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for MCAT 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer?.
Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer? for MCAT 2024 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for MCAT 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements accurately describes the molecular vibrations characteristic of IR spectroscopy?a)Stretching frequencies appear mostly in the fingerprint region.b)Triple bonds have lower stretching frequencies than corresponding double bonds, which in turn have lower frequencies than single bonds.c)Bonds to hydrogen have higher stretching frequencies than those to heavier atoms.d)Stretching frequencies are lower than corresponding bending frequencies.Correct answer is option 'C'. Can you explain this answer?.
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