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d-footprint 12-The region of an infra-red spectrum where many absorptions take place is known as the... a-thumbprint region b-fingerprint region c-handprint region 13-Which of the following statements about tetramethylsilane is incorrect? a- it is inert b- it is used to provide a reference against which other peaks are measured e-it produces a single peak at D-10 d- it is volatile and can be easily distilled off and used again 14. The 1H NMR spectrum shows 4 absorptions. Which of the following compounds is the unknown compound? CH₂ CH₂ () CH₂ CH₂ 15. What is the multiplicity expected in the hydrogen NMR spectrum for the hydrogen atoms marked by a "star" in the following compound? a-Singlet A) B) C) D) CH₂ i CH₂-C-CH₂-CH₂ c-quartet b- triplet CH₂ 16-The number of signals shows: b-The shifts of these protons a-shows the number of protons on adjacent atoms. e-how many number of protons are present. d-how many different kinds of protons are present d-heptet 17-When an external magnetic field is applied, what happens to the protons in a sample? All protons align with the field. All protons align opposite to the field. Some protons align with the field and some align opposite to it. All protons assume a random orientation 18. What is the structure of the compound that gives the following infrared spectrum? mm www a-Ketone b- Alcohol c-carboxylic acid d- Aromatic 19- Which of the following compounds has the MOST deshielded protons? D) CH4 B) C) CH3Br CH31 CH3CH A) 20-TMS(tetramethylsilane) is added to the sample because: a-protons of TMS is highly shielded b-Protons are less shielded of the above

d-footprint 12-The region of an infra-red spectrum where many absorptions take place is known as the... a-thumbprint region b-fingerprint region c-handprint region 13-Which of the following statements about tetramethylsilane is incorrect? a- it is inert b- it is used to provide a reference against which other peaks are measured e-it produces a single peak at D-10 d- it is volatile and can be easily distilled off and used again 14. The 1H NMR spectrum shows 4 absorptions. Which of the following compounds is the unknown compound? CH₂ CH₂ () CH₂ CH₂ 15. What is the multiplicity expected in the hydrogen NMR spectrum for the hydrogen atoms marked by a "star" in the following compound? a-Singlet A) B) C) D) CH₂ i CH₂-C-CH₂-CH₂ c-quartet b- triplet CH₂ 16-The number of signals shows: b-The shifts of these protons a-shows the number of protons on adjacent atoms. e-how many number of protons are present. d-how many different kinds of protons are present d-heptet 17-When an external magnetic field is applied, what happens to the protons in a sample? All protons align with the field. All protons align opposite to the field. Some protons align with the field and some align opposite to it. All protons assume a random orientation 18. What is the structure of the compound that gives the following infrared spectrum? mm www a-Ketone b- Alcohol c-carboxylic acid d- Aromatic 19- Which of the following compounds has the MOST deshielded protons? D) CH4 B) C) CH3Br CH31 CH3CH A) 20-TMS(tetramethylsilane) is added to the sample because: a-protons of TMS is highly shielded b-Protons are less shielded of the above

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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I need help with questions 12-20 please
**Educational Website Transcription: Chemistry Focus** --- **Questions and Concepts** 12. **Infrared Spectrum Regions** - The region of an infrared spectrum where many absorptions are found is: - a. thumbprint region - b. fingerprint region - c. handprint region - d. footprint region 13. **Isomeric Compound Statements** - Which statement about tert-amylmethylamine is incorrect? - a. It produces a single peak at m/z 100. - b. Its volatile nature allows it to be easily distilled. - c. The compound is used as an octane booster. - d. The infrared spectrum shows four absorptions. 14. **Hydrogen NMR Spectrum** - The 1H NMR spectrum shows four absorptions. Which of the following compounds does this represent? 15. **Proton Multiplicity in NMR** - What is the expected multiplicity for the ‘next nearest’ protons in a compound? 16. **The Magnetic Field and Protons** - When an external magnetic field is applied, what generally happens to protons? - a. All protons align opposite to the field. - b. All protons align in the same direction. - c. Some protons align with the field, and some align opposite. - d. Protons assume a random orientation. 17. **Number of Signal Areas in NMR** - The number of signal areas in an NMR spectrum indicates: - a. how many protons are present. - b. how many different kinds of protons are present. - c. the number of electrons. - d. the number of carbon atoms. 18. **Determining Compound Structure from Spectrum** - Based on an NMR spectrum, what is the structure of the compound shown? **Diagram and Figure Explanation** - **Infrared Spectrum Graph** - A graphical representation featuring a curve with peaks and troughs, indicating different absorption levels across various frequencies or wavelengths. The main vertical axis represents absorption intensity, while the horizontal axis is likely in terms of wavelength or frequency (such as cm⁻¹). --- This transcription provides a clear and educational summary tailored for a chemistry-focused academic audience, with detailed explanations provided for both textual parts and visual elements of the document.
Transcribed Image Text:**Educational Website Transcription: Chemistry Focus** --- **Questions and Concepts** 12. **Infrared Spectrum Regions** - The region of an infrared spectrum where many absorptions are found is: - a. thumbprint region - b. fingerprint region - c. handprint region - d. footprint region 13. **Isomeric Compound Statements** - Which statement about tert-amylmethylamine is incorrect? - a. It produces a single peak at m/z 100. - b. Its volatile nature allows it to be easily distilled. - c. The compound is used as an octane booster. - d. The infrared spectrum shows four absorptions. 14. **Hydrogen NMR Spectrum** - The 1H NMR spectrum shows four absorptions. Which of the following compounds does this represent? 15. **Proton Multiplicity in NMR** - What is the expected multiplicity for the ‘next nearest’ protons in a compound? 16. **The Magnetic Field and Protons** - When an external magnetic field is applied, what generally happens to protons? - a. All protons align opposite to the field. - b. All protons align in the same direction. - c. Some protons align with the field, and some align opposite. - d. Protons assume a random orientation. 17. **Number of Signal Areas in NMR** - The number of signal areas in an NMR spectrum indicates: - a. how many protons are present. - b. how many different kinds of protons are present. - c. the number of electrons. - d. the number of carbon atoms. 18. **Determining Compound Structure from Spectrum** - Based on an NMR spectrum, what is the structure of the compound shown? **Diagram and Figure Explanation** - **Infrared Spectrum Graph** - A graphical representation featuring a curve with peaks and troughs, indicating different absorption levels across various frequencies or wavelengths. The main vertical axis represents absorption intensity, while the horizontal axis is likely in terms of wavelength or frequency (such as cm⁻¹). --- This transcription provides a clear and educational summary tailored for a chemistry-focused academic audience, with detailed explanations provided for both textual parts and visual elements of the document.
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