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An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:
- a)2960 and 2870 cm–1
- b)3200 and 3100 cm–1
- c)1800 and 1700 cm–1
- d)1650 and 1450 cm–1
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
An examinations of saturated hydrocarbons containing methyl group show...
Saturated hydrocarbons are compounds that contain only single bonds between carbon atoms. The presence of a methyl group (-CH3) in a saturated hydrocarbon molecule causes the molecule to have both asymmetrical and symmetrical stretching modes. These stretching modes can be observed in the infrared (IR) spectrum of the molecule.
Explanation:
IR spectroscopy involves the absorption of infrared radiation by a molecule, which causes the vibrational modes of the molecule to change. The IR spectrum of a molecule is unique and can be used to identify the presence of functional groups in the molecule.
The asymmetrical stretching mode (Vas) occurs when the C-H bond in the methyl group stretches in an asymmetric manner. This stretching mode causes a shift of the C-H bond dipole moment, resulting in an absorption band in the IR spectrum. The frequency of this band is typically in the range of 2960-2870 cm-1.
The symmetrical stretching mode (Vs) occurs when the C-H bond in the methyl group stretches in a symmetrical manner. This stretching mode does not cause a shift of the C-H bond dipole moment and results in a separate absorption band in the IR spectrum. The frequency of this band is typically in the range of 2960-2870 cm-1, but is usually slightly lower than the frequency of the asymmetrical stretching mode.
Therefore, the correct answer is option 'A', which states that the asymmetrical (Vas) and symmetrical (Vs) stretching modes of saturated hydrocarbons containing a methyl group occur in the region of 2960 and 2870 cm-1.
Explanation:
IR spectroscopy involves the absorption of infrared radiation by a molecule, which causes the vibrational modes of the molecule to change. The IR spectrum of a molecule is unique and can be used to identify the presence of functional groups in the molecule.
The asymmetrical stretching mode (Vas) occurs when the C-H bond in the methyl group stretches in an asymmetric manner. This stretching mode causes a shift of the C-H bond dipole moment, resulting in an absorption band in the IR spectrum. The frequency of this band is typically in the range of 2960-2870 cm-1.
The symmetrical stretching mode (Vs) occurs when the C-H bond in the methyl group stretches in a symmetrical manner. This stretching mode does not cause a shift of the C-H bond dipole moment and results in a separate absorption band in the IR spectrum. The frequency of this band is typically in the range of 2960-2870 cm-1, but is usually slightly lower than the frequency of the asymmetrical stretching mode.
Therefore, the correct answer is option 'A', which states that the asymmetrical (Vas) and symmetrical (Vs) stretching modes of saturated hydrocarbons containing a methyl group occur in the region of 2960 and 2870 cm-1.
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An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer?
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An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer?.
An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer?.
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An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer?, a detailed solution for An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:a)2960 and 2870 cm–1b)3200 and 3100 cm–1c)1800 and 1700 cm–1d)1650 and 1450 cm–1Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
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