Homework Answers
A peak around 1250cm-1 is generally of the C-N stretching vibrations. In the first compound, we have N bonded to C and therefore it's the right choice.
In all the other compounds, no C single bond N are there so no characteristic peak around 1250 will be observed.
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Part A Which of the following species has a characteristic absorption at 1250 cm in its...
The vibration of which bond gives an IR absorption that distinguishes between the following two compounds?...
The vibration of which bond gives an IR absorption that distinguishes between the following two compounds? CH3 CH2 CH2 OH CH3 CH2 OCH3 What is the approximate wavenumber (cm-1) of that band? Select answer 1050 1250 1450 1700 3500
14. An unknown compound shows an intense IR absorption at 1710 cm- and gives the following...
14. An unknown compound shows an intense IR absorption at 1710 cm- and gives the following NMR spectrum: 8 1.1, doublet, 6Hs; 8 2.1, singlet, 3Hs; and 8 2.3-2.8, broad multiplet, 1H. Which structure is the compound? a) (CH3)2CHOCH3 с) CH:C-O)CH-CH-CH3 ect r b) CH3CH2CH2OCH3 d) (CH3)2CHC(O)CH3 15. This NMR spectrum corresponds to which compound? 2H 1H 1.7 ppm 1H O.5 1.5 1 2 2.5 3.5 4.5 4 5 бн (рpm) b) CH3CH2CH2CH2OH d) CH3CH2CH(OH)CH3 a) (CH3)3COH c) (CH)2СHCH,ОН 13
shows a strong infrared absorption at nglet peaks at δ 1.3 and Its 'H 66. A...
shows a strong infrared absorption at nglet peaks at δ 1.3 and Its 'H 66. A compound 1100 em, NMR spectrum has sharp si ut no absorption at 3300 to 3400 cm 40 ppm (intensity 3:2). Its proton decoupled spectrum shows three peaks at 8 20, 68 and 98 ppm What is the structure of the compound? CH CH (A) O O OCH (B) CH3o OCH3 (D) CH3o Which compound will have only two absorption peaks in its proton decoupled...
5-14) A compound A has a strong, broad IR absorption at 3200–3500 cm–1 and the proton...
5-14) A compound A has a strong, broad IR absorption at
3200–3500 cm–1 and the proton NMR spectrum shown below. Treatment
of compound A with H2SO4 gives compound B, which has the NMR
spectrum shown at bottom and a molecular ion at m/z = 84 in its EI
mass spectrum. Identify compounds A and B.
Question 5 of 5 A compound A has a strong, broad IR absorption at 3200-3500 cm 1 and the proton NMR spectrum shown below. Treatment...
The IR spectrum of a sample contains absorptions at 3050, 2950, and 1620 cm^-1. To what...
The IR spectrum of a sample contains absorptions at 3050, 2950, and 1620 cm^-1. To what class of organic compound does this sample most likely belong? A) alkane B) alkene C) alkyne D) ester E) alcohol Which of the following most closely matches the C C stretching frequency? A) 3300 B) 3000 C) 2200 D) 1700 E) 1200 What IR absorption is characteristic of the terminal C-H stretch in terminal alkynes? A) 3500 cm^-1 B) 3300 cm^-1 C) 2400 cm^-1...
Part A Which of the following compounds is the most stable? CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3...
Part A Which of the following compounds is the most stable? CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH Submit Submit Request Answer Request Answer Part B Which is the least stable? CH2CH3 CH2CH3 СН3 CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH3 Submit Submit Request Answer Reguente Part C Which has the smallest heat of hydrogenation? CH2CH3 O CH₂CHS CH2CH3 CH3 CH2CH3 CH.CH CH2CH3 CH3 CH2CH3 CH2CH3 CH3 Submit Request Answer
Can someone please explain this? Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm)...
Can someone please explain this?
Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm) Functional Group Absorption (cm"!) Alkene Alkane C-H 2850-2960 =C-H 3020-3100 C-C 800-1300 1640-1680 C=C RCH=CH2 Alkyne 910 and 990 =C-H 3300 R2C=CH2 890 2100-2260 C=C Alcohol O-H C-O Alkyl halide C-C1 3400-3650 600-800 1050-1150 C-Br 500-600 Amine Arene C-H N-H 3300-3500 3030 C-N 1030-1230 1660-2000 1450-1600 Aldehyde Ketone 1730 1715 1705 1690 Non-conjugated C-0 Conjugated C=0 Carboxylic acid C=0 Non-conjugated C-0 Conjugated C=0 Amide...
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and...
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and outer radii, respectively. The surface charge density on the inside surface is -150nC/m2. The surface charge density on the exterior surface is +150nC/m What is the strength of the electric field at point 4 cm from the center? Express your answer to three significant figures and include the appropriate units 86062 N/C Submit Previous AnswersRequest Answer X Incorrect; Try Again; 4 attempts remaining Part...
Match the following spectral descriptions with one of the compounds shown below. A compound is NOT...
Match the following spectral descriptions with one of the compounds shown below. A compound is NOT used more than once. [ Select] AC4HO2 compound has a strong IR absorption at 3300-3400 cm-1. The 1 H NMR spectrum has two singlets at 8 4.2 and 4.4 ppm: relative areas 4:2..The 13C spectrum shows 2 signals at 8 85 and 52 ppm. [ Select] AC7HO compound has a strong IR absorption at 1700 cm?, The H NMR spectrum has a singlet at...
References) Give one fragment in the mass spectrum and one peak in the IR spectrum that...
References) Give one fragment in the mass spectrum and one peak in the IR spectrum that could be used to distinguish between these two isomers: CH3 HаC a. HаС b. "CHз CH3 4-methylpentan-2-one 3-methylpentanal (Designate which compound will show that diagnostic fragment or peak by preceding the value with the letter of the compound, ie. "a47" or "b1730". Do not include any units.) Mass spectrum: IR spectrum Characteristic IR Absorptions of Some Functional Groups Absorption (cm) Functional Group Absorption (cm...
The vibration of which bond gives an IR absorption that distinguishes between the following two compounds? CH3 CH2 CH2 OH CH3 CH2 OCH3 What is the approximate wavenumber (cm-1) of that band? Select answer 1050 1250 1450 1700 3500
14. An unknown compound shows an intense IR absorption at 1710 cm- and gives the following NMR spectrum: 8 1.1, doublet, 6Hs; 8 2.1, singlet, 3Hs; and 8 2.3-2.8, broad multiplet, 1H. Which structure is the compound? a) (CH3)2CHOCH3 с) CH:C-O)CH-CH-CH3 ect r b) CH3CH2CH2OCH3 d) (CH3)2CHC(O)CH3 15. This NMR spectrum corresponds to which compound? 2H 1H 1.7 ppm 1H O.5 1.5 1 2 2.5 3.5 4.5 4 5 бн (рpm) b) CH3CH2CH2CH2OH d) CH3CH2CH(OH)CH3 a) (CH3)3COH c) (CH)2СHCH,ОН 13
shows a strong infrared absorption at nglet peaks at δ 1.3 and Its 'H 66. A compound 1100 em, NMR spectrum has sharp si ut no absorption at 3300 to 3400 cm 40 ppm (intensity 3:2). Its proton decoupled spectrum shows three peaks at 8 20, 68 and 98 ppm What is the structure of the compound? CH CH (A) O O OCH (B) CH3o OCH3 (D) CH3o Which compound will have only two absorption peaks in its proton decoupled...
5-14) A compound A has a strong, broad IR absorption at
3200–3500 cm–1 and the proton NMR spectrum shown below. Treatment
of compound A with H2SO4 gives compound B, which has the NMR
spectrum shown at bottom and a molecular ion at m/z = 84 in its EI
mass spectrum. Identify compounds A and B.
Question 5 of 5 A compound A has a strong, broad IR absorption at 3200-3500 cm 1 and the proton NMR spectrum shown below. Treatment...
The IR spectrum of a sample contains absorptions at 3050, 2950, and 1620 cm^-1. To what class of organic compound does this sample most likely belong? A) alkane B) alkene C) alkyne D) ester E) alcohol Which of the following most closely matches the C C stretching frequency? A) 3300 B) 3000 C) 2200 D) 1700 E) 1200 What IR absorption is characteristic of the terminal C-H stretch in terminal alkynes? A) 3500 cm^-1 B) 3300 cm^-1 C) 2400 cm^-1...
Part A Which of the following compounds is the most stable? CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH Submit Submit Request Answer Request Answer Part B Which is the least stable? CH2CH3 CH2CH3 СН3 CH2CH3 CH2CH3 CH3 CH2CH3 CH2CH3 CH3 Submit Submit Request Answer Reguente Part C Which has the smallest heat of hydrogenation? CH2CH3 O CH₂CHS CH2CH3 CH3 CH2CH3 CH.CH CH2CH3 CH3 CH2CH3 CH2CH3 CH3 Submit Request Answer
Can someone please explain this?
Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm) Functional Group Absorption (cm"!) Alkene Alkane C-H 2850-2960 =C-H 3020-3100 C-C 800-1300 1640-1680 C=C RCH=CH2 Alkyne 910 and 990 =C-H 3300 R2C=CH2 890 2100-2260 C=C Alcohol O-H C-O Alkyl halide C-C1 3400-3650 600-800 1050-1150 C-Br 500-600 Amine Arene C-H N-H 3300-3500 3030 C-N 1030-1230 1660-2000 1450-1600 Aldehyde Ketone 1730 1715 1705 1690 Non-conjugated C-0 Conjugated C=0 Carboxylic acid C=0 Non-conjugated C-0 Conjugated C=0 Amide...
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and outer radii, respectively. The surface charge density on the inside surface is -150nC/m2. The surface charge density on the exterior surface is +150nC/m What is the strength of the electric field at point 4 cm from the center? Express your answer to three significant figures and include the appropriate units 86062 N/C Submit Previous AnswersRequest Answer X Incorrect; Try Again; 4 attempts remaining Part...
Match the following spectral descriptions with one of the compounds shown below. A compound is NOT used more than once. [ Select] AC4HO2 compound has a strong IR absorption at 3300-3400 cm-1. The 1 H NMR spectrum has two singlets at 8 4.2 and 4.4 ppm: relative areas 4:2..The 13C spectrum shows 2 signals at 8 85 and 52 ppm. [ Select] AC7HO compound has a strong IR absorption at 1700 cm?, The H NMR spectrum has a singlet at...
References) Give one fragment in the mass spectrum and one peak in the IR spectrum that could be used to distinguish between these two isomers: CH3 HаC a. HаС b. "CHз CH3 4-methylpentan-2-one 3-methylpentanal (Designate which compound will show that diagnostic fragment or peak by preceding the value with the letter of the compound, ie. "a47" or "b1730". Do not include any units.) Mass spectrum: IR spectrum Characteristic IR Absorptions of Some Functional Groups Absorption (cm) Functional Group Absorption (cm...
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