Organic Spectroscopy

ABC26OR0947 · An organic compound (MF = C8H10O) exhibited the following 1H NMR spectral data: delta 2.5 (3H, s), 3.8 (3H, s), 6.8 (2H, d, J = 8 Hz), 7.2… · DEC 2011

ABC26OR0123 · In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at · DEC 2012

ABC26OR0955 · In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at · DEC 2012

ABC26OR0957 · In the IR spectrum, the absorption band due to carbonyl group in phenyl acetate appears at · JUNE 2013

ABC26OR0127 · In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at · DEC 2013

ABC26OR0960 · In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at · DEC 2013 self-practice

ABC26OR0973 · Intense band generally observed for a carbonyl group in the IR spectrum is due to · JUNE 2015

ABC26OR1002 · In IR spectrum, recorded neat, a compound shows a strong and broad band at 3300 cm-1. The band becomes sharp and shifts to 3600 cm-1 when… · DEC 2019

ABC26OR0138 · The frequency of O-H stretch occurs at 3600 cm-1. The O-D stretch frequency (in cm-1) would be closest to · DEC 2019

ABC26OR1004 · The frequency of O-H stretch occurs at 3600 cm-1. The O-D stretch frequency (in cm-1) would be closest to · DEC 2019

ABC26OR0942 · In the mass spectrum of dichlorobenzene the ratio of the peaks at m/z 146, 148 and 150, is: · JUNE 2011

ABC26OR0946 · In the mass spectrum of dodecahedron (C20 H20), approximate ratio of the peaks at m / z=260 and 261 is · DEC 2011

ABC26OR0128 · The mass of metastable ion produced due to decomposition of F1^+ in the following mass fragmentation sequence is Diethyl-phthalate (M +… · DEC 2014

ABC26OR0968 · The mass of metastable ion produced due to decomposition of F1 + in the following mass fragmentation sequence is Diethyl-phthalate → F1 + →… · DEC 2014

ABC26OR0979 · In the mass spectrum of 1,2-dichloroethane, approximate ratio of peaks at m/z values 98, 100, 102 will be · DEC 2015

ABC26OR0941 · In the broad band decoupled 13C NMR spectrum, the numbers of signals apperating for the bicyclooctane A-C, respectively are (A) (B) (C) · JUNE 2011

ABC26OR0950 · The number of signals that appear in the broadband decoupled 13C NMR spectrum of phenanthrene and anthracene, respectively are · JUNE 2012

ABC26OR0969 · The ratio of the relative intensities of the carbon signals in the first order 13C NMR spectrum of CD3Cl is · DEC 2014

ABC26OR0974 · Number of signals in the 13C{1H} NMR spectrum of (R)-4-methylpentan-2-ol are · JUNE 2015

ABC26OR0951 · In the 400 MHz, 1H NMR spectrum of organic compound exhibited a doublet. The two lines of the doublet are at delta 2.35 and 2.38 ppm. The… · JUNE 2012

ABC26OR0963 · Methyl 4-oxopentanoate exhibited signals at delta 208, 172, 51, 37, 32 and 27 ppm in its 13 C NMR spectrum. The signals due to the methoxy… · DEC 2013

ABC26OR0972 · The 1H NMR spectrum of a dilute solution of a mixture of acetone and dichloromethane in CDCl3 exhibits two singlet of 1:1 intensity. Molar… · JUNE 2015

ABC26OR0978 · The number of chemical shift non-equivalent protons expected in 1H NMR spectrum of alpha -pinene is alpha -pinene · DEC 2015

ABC26OR0129 · 1H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741… · DEC 2016

ABC26OR0982 · 1H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741… · DEC 2016

ABC26OR0984 · 1H NMR spectrum of a mixture of benzene and acetonitrile shows two singlets of equal integration. The molar ratio of benzene: acetonitrile… · DEC 2016

ABC26OR0130 · 13C NMR spectrum of DMSO-d6 gives a signal at delta 39.7 ppm as a · JUNE 2017

ABC26OR0986 · 13C NMR spectrum of DMSO-d6 gives a signal at delta 39.7 ppm as a · JUNE 2017

ABC26OR1003 · The correct match of 13C NMR chemical shift values (delta ppm) for pyridine is · DEC 2019

ABC26OR1007 · The natural product that gives a signal at 218 ppm in its 13C NMR spectrum is · DEC 2019

ABC26OR1012 · A compound shows [M]+ at m/z 84 and has base peak at 56. It exhibits only one peak in 1H NMR at delta 1.4 ppm and one signal in 13C NMR at… · JUNE 2021

ABC26OR0705 · 1H NMR spectrum of [18]– annulene shows · 2000-2022

ABC26OR0940 · The absorption at lambda max =279 nm (varepsilon =15) in the UV spectrum of acetone is due to · JUNE 2011

ABC26OR0716 · The number of signals that appear in the broad-band decoupled 13C NMR spectrum of ortho-, meta-and para-dichlorobenzenes, respectively, are · 2000-2022

ABC26OR0726 · In the proton decoupled 13C NMR spectrum of 7-norbornanone, the number of signals obtained is · 2000-2022

ABC26OR0727 · The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH3Br) in the mass spectrum is: · 2000-2022

ABC26OR0728 · The number of signals that appear in the proton decoupled 13C NMR spectrum of benzonitrile (C7H5N) is · 2000-2022

ABC26OR0729 · Among the compound given in the option (a) to (d), the one that exhibits a sharp band at around 3300 cm-1 in the IR spectrum is: · 2000-2022

ABC26OR0733 · The product of the following reaction gave 6 line 13 C NMR spectrum with peaks at delta 175,52,50,46,37,33 ppm. The structure of the… · 2000-2022

ABC26OR0734 · Given the fact that 1, 3-butadiene has a UV absorption of 217nm, the absorption wavelength (in nm) for the conjugated system shown below is… · 2000-2022

ABC26OR0735 · The m/z value of the detectable fragment formed by McLafferty like rearrangement of the following compound in mass spectrometer is ____ · 2000-2022

ABC26OR0736 · The total number of lines expected (due to spin-spin coupling of proton with fluorine and deuterium nuclei) in the 1 H NMR spectrum of the… · 2000-2022

ABC26OR0737 · The 13C NMR spectrum of acetone – d6 has a signal at 30 ppm as a septet in the intensity ratio · 2000-2022

ABC26OR0739 · the elimination product of the following reaction is · 2000-2022

ABC26OR0740 · Major product formed in the following reaction sequence is: · 2000-2022 self-practice

ABC26OR0741 · Consider two rectangular sheets, Sheet M and Sheet N of dimensions 6 cm × 4 cm each. Folding operation 1: The sheet is folded into half by… · 2000-2022 self-practice

ABC26OR0990 · Using a double beam UV-visible spectrophotometer, Beer's law fails for K2Cr2O7 solution when · JUNE 2018

ABC26OR0136 · In the 31P{1H} NMR spectrum of a diamagnetic complex mer–[M(PR3)3Cl3] expected number of resonance is · DEC 2018