Homework Answers
Hence, the most abondont ion peak is appearing for m/z= 85 because the more +I effect given by the Me gruop in m/z =43 which will disappear the molecular ion peak.
Ans:(D) 85
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Question 2. In the mass spectrum of 3,3-dimethyl-2-butanone, the base peak will occur at m/z A)...
2. Draw the structure of the cation responsible for the base peak (m/z=58) in the mass...
2. Draw the structure of the cation responsible for the base
peak (m/z=58) in the mass spectrum of 3-aminopentane shown
below:
3. Below is given the mass spectrum of a simple alkane. What is
the chemical formula of the alkane? What is the name of the alkane?
Explain how you determined the exact structure of the alkane from
the observed fragments.
4. Below is a mass spectrum of an ester. Identify the ester.
Consider that the dominant fragmentation pathway involves...
5 The parent peak in the mass spectrum shown below is at 100 80 6o 40...
5 The parent peak in the mass spectrum shown below is at 100 80 6o 40 C 20 10 20 3 40 070 90 m/z (a) m/z 58 (b) m/z -71 (c) m/z - 86 (d) m/z 43 6 In mass spectrometry of the following organic compound, which of the following fragmentation pathway is not likely to occur? H3C CH H3C (a) dehydration (b) Alpha-cleavage (c) McLafferty rearrangement (d) All of these
la) Consider the mixed aldol condensation reaction of 1-methylcyclopentane-1-carbaldehyde (shown below) and 3,3-dimethyl-2-butanone (shown below) in...
la) Consider the mixed aldol condensation reaction of 1-methylcyclopentane-1-carbaldehyde (shown below) and 3,3-dimethyl-2-butanone (shown below) in the presence of sodium hydroxide Provide the expected major MIXED aldol condensation product for this reaction (can exist as E or Z isomer so you can draw either) b) Would you have to heat the reaction mixture in order for the reaction to form the aldol condensation product? Why or wh y not? 2) Consider the mixed aldol condensation reaction of 3,3-dimethyl-2-butanone (shown in...
Show what fragment is responsible for the base peak at m/z 44 in the mass spectrum...
Show what fragment is responsible for the base peak at m/z 44 in the mass spectrum of butan-2-amine
The m/z of the M+ peak of an unknown is 146, and this peak is the base peak (i.e., the tallest pe...
The m/z of the M+ peak of an unknown is 146, and this peak is the base peak (i.e., the tallest peak). (See below mass spectrum of the unknown.) Combustion analysis data indicate 49.03% carbon and 2.74% hydrogen. The IR spectrum and 13C-NMR spectrum of this compound also were obtained and are shown below. Given this information, what is the name of this unknown molecule? MASS SPECTRUM 100 80 60 面 40 20 0.0 120 160 40 80 0.0 m/z...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. 33 N - PPM 5. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. doublet 2...
The compound given is 3,3-dimethyl-2-butanone. Interpret the 1H-NMR spectrum, detailing chemical shifts and splittings, draw the...
The compound given is 3,3-dimethyl-2-butanone.
Interpret the 1H-NMR spectrum, detailing chemical shifts and
splittings, draw the structure of the compound and label hydrogens
(a,b,c,d,e) for the signals.
Interpret the 13C-NMR spectrum and draw the structure of the
compound and label carbons (a,b,c,d,e) for the signals.
Interpret the IR spectrum and draw the structure of the
compound, and label functional groups that are responsible for the
stretches.
amk UIT IKLUUENCY PPM INTENSITY 1071.875 575.350 572.946 2.1432 1.1505 1.1475 IHNMR 6.882 16.205...
The mass spectrum of pentanal shows a peak at m/z 43. The molecular weight of pentanal...
The mass spectrum of pentanal shows a peak at m/z 43. The molecular weight of pentanal is 86. Draw the electron flow and products for the formation of the cation, m/z 43 and radical fragment. ? + ? M: 86 m/z 43 cation (M-43) radical
21. Benzaldehyde is treated with 3,3-dimethyl-2-butanone and KOH at 100 °C. Select the resulting product: Ph...
21. Benzaldehyde is treated with 3,3-dimethyl-2-butanone and KOH at 100 °C. Select the resulting product: Ph OH OH O Ph Ph Ph A. B. C D. 22. The mixed Claisen reaction shown provides product in only a trace amount. The starting materials are obtained upon isolation. Why? CO,Me CO-Me NAOMe MeOH dil. HCI .COMe Ph A. pka of the propyl ester is too high B. there is only one c-proton C. the benzoate ester is resonance stabilized D. pka of...
Problem 13.7 The base peak in the mass spectrum of 2,2,4-trimethylpentane [(CHa)3CCH2CHCH3)2l occurs at m/z 57....
Problem 13.7 The base peak in the mass spectrum of 2,2,4-trimethylpentane [(CHa)3CCH2CHCH3)2l occurs at m/z 57. What ion is responsible for this peak and why is this ion the most abundant fragment?
2. Draw the structure of the cation responsible for the base
peak (m/z=58) in the mass spectrum of 3-aminopentane shown
below:
3. Below is given the mass spectrum of a simple alkane. What is
the chemical formula of the alkane? What is the name of the alkane?
Explain how you determined the exact structure of the alkane from
the observed fragments.
4. Below is a mass spectrum of an ester. Identify the ester.
Consider that the dominant fragmentation pathway involves...
5 The parent peak in the mass spectrum shown below is at 100 80 6o 40 C 20 10 20 3 40 070 90 m/z (a) m/z 58 (b) m/z -71 (c) m/z - 86 (d) m/z 43 6 In mass spectrometry of the following organic compound, which of the following fragmentation pathway is not likely to occur? H3C CH H3C (a) dehydration (b) Alpha-cleavage (c) McLafferty rearrangement (d) All of these
la) Consider the mixed aldol condensation reaction of 1-methylcyclopentane-1-carbaldehyde (shown below) and 3,3-dimethyl-2-butanone (shown below) in the presence of sodium hydroxide Provide the expected major MIXED aldol condensation product for this reaction (can exist as E or Z isomer so you can draw either) b) Would you have to heat the reaction mixture in order for the reaction to form the aldol condensation product? Why or wh y not? 2) Consider the mixed aldol condensation reaction of 3,3-dimethyl-2-butanone (shown in...
The m/z of the M+ peak of an unknown is 146, and this peak is the base peak (i.e., the tallest peak). (See below mass spectrum of the unknown.) Combustion analysis data indicate 49.03% carbon and 2.74% hydrogen. The IR spectrum and 13C-NMR spectrum of this compound also were obtained and are shown below. Given this information, what is the name of this unknown molecule? MASS SPECTRUM 100 80 60 面 40 20 0.0 120 160 40 80 0.0 m/z...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. 33 N - PPM 5. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. doublet 2...
The compound given is 3,3-dimethyl-2-butanone.
Interpret the 1H-NMR spectrum, detailing chemical shifts and
splittings, draw the structure of the compound and label hydrogens
(a,b,c,d,e) for the signals.
Interpret the 13C-NMR spectrum and draw the structure of the
compound and label carbons (a,b,c,d,e) for the signals.
Interpret the IR spectrum and draw the structure of the
compound, and label functional groups that are responsible for the
stretches.
amk UIT IKLUUENCY PPM INTENSITY 1071.875 575.350 572.946 2.1432 1.1505 1.1475 IHNMR 6.882 16.205...
The mass spectrum of pentanal shows a peak at m/z 43. The molecular weight of pentanal is 86. Draw the electron flow and products for the formation of the cation, m/z 43 and radical fragment. ? + ? M: 86 m/z 43 cation (M-43) radical
21. Benzaldehyde is treated with 3,3-dimethyl-2-butanone and KOH at 100 °C. Select the resulting product: Ph OH OH O Ph Ph Ph A. B. C D. 22. The mixed Claisen reaction shown provides product in only a trace amount. The starting materials are obtained upon isolation. Why? CO,Me CO-Me NAOMe MeOH dil. HCI .COMe Ph A. pka of the propyl ester is too high B. there is only one c-proton C. the benzoate ester is resonance stabilized D. pka of...
Problem 13.7 The base peak in the mass spectrum of 2,2,4-trimethylpentane [(CHa)3CCH2CHCH3)2l occurs at m/z 57. What ion is responsible for this peak and why is this ion the most abundant fragment?
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