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17 Nov 2019
^1 H nuclei located near electronegative atoms tend to be_______relative to^1 H nuclei which are not. shielded deshielded resonance split none of the above If a molecule contains 4 elements of unsaturation and signals in the^1 H NMR spectrum between delta 7.0 and 8.0 ppm, what structural group is likely to be present? A carbonyl group an aromatic ring a hydroxyl group a cyclohexyl ring a carbon-carbon triple bond which of the following functional groups has the most deshielded proton and would be predicted to show an NMR signal that is the farthest downfield? Benzylic-H allylic-H aldehyde-H aromatic-H acetylenic-H Using a 60-MHz spectrometer, the protons in dichloromethane appear at 5.30 ppm. When the same sample is placed in a 100-MHz instrument, where does the signal appear? 8.33 5.30 3.18 cannot be determined from information given The protons marked H_a and H_b in the molecule below are_______chemically equivalent or homotopic enantiotopic diastereotopic endotopic none of the above What is the relative area of each peak in a quartet spin-spin splitting pattern? 1:2:1 1:2:2:1 1:1:1:1 1:4:4:1 1:3:3:1 What compound exhibits only two signals in its^1 H NMR spectrum, a triplet and a quintet? BrCH_2 CH_2 CH_2 Br Br CH_2 CH_2 CH_2 Cl (CH_3)_2 CHCH(CH_3)_2 CH_3 CH_2 CH_2 CH_3 (CH_3)_2 CHOCH(CH_3)_2
^1 H nuclei located near electronegative atoms tend to be_______relative to^1 H nuclei which are not. shielded deshielded resonance split none of the above If a molecule contains 4 elements of unsaturation and signals in the^1 H NMR spectrum between delta 7.0 and 8.0 ppm, what structural group is likely to be present? A carbonyl group an aromatic ring a hydroxyl group a cyclohexyl ring a carbon-carbon triple bond which of the following functional groups has the most deshielded proton and would be predicted to show an NMR signal that is the farthest downfield? Benzylic-H allylic-H aldehyde-H aromatic-H acetylenic-H Using a 60-MHz spectrometer, the protons in dichloromethane appear at 5.30 ppm. When the same sample is placed in a 100-MHz instrument, where does the signal appear? 8.33 5.30 3.18 cannot be determined from information given The protons marked H_a and H_b in the molecule below are_______chemically equivalent or homotopic enantiotopic diastereotopic endotopic none of the above What is the relative area of each peak in a quartet spin-spin splitting pattern? 1:2:1 1:2:2:1 1:1:1:1 1:4:4:1 1:3:3:1 What compound exhibits only two signals in its^1 H NMR spectrum, a triplet and a quintet? BrCH_2 CH_2 CH_2 Br Br CH_2 CH_2 CH_2 Cl (CH_3)_2 CHCH(CH_3)_2 CH_3 CH_2 CH_2 CH_3 (CH_3)_2 CHOCH(CH_3)_2
Nelly StrackeLv2
17 Mar 2019