Organic Spectroscopy
84 questions in this chapter, page 2 of 2.
Study loop for Organic Spectroscopy
1. Practise the PYQsPrevious-year questions, with answers
NMR 1H
ABC26OR0135 · The correct match of protons in column A with the 1H NMR chemical shifts in column B for the product of the following reaction is → · JUNE 2018
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
ABC26OR1011 · Which of the following molecule has the 1H NMR spectrum: delta 2.3 (s, 3H), 3.9 (s, 3H), 7.25 (d, J=7Hz, 2H), 7.95 (d, J=7Hz, 2H) ppm. · JUNE 2021
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
Organic Spectroscopy – General
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
ABC26OR0706 · An organic compound having molecular formula C8 H12 O2 exhibits the following peacks in IR and 1 H NMR spectra. IR : 1720 (cm-1) 1 H NMR… · 2000-2022
ABC26OR0709 · Match the structure in List - I with the coupling constant [1H J(Hz)] given in List - II List - I (1) (2) (3) List - II (i) ~ 1 Hz (ii) ~… · 2000-2022
ABC26OR0710 · Match the observed principal absorptions in the visible spectrum shown List – I with the bond show this absorption in List – II List – I… · 2000-2022
ABC26OR0712 · The direction of rotation of the following thermal electrocyclic ring closures.; ⇌; respectively is: · 2000-2022
ABC26OR0713 · The IR stretching frequencies (cm-1) for the compound X are as follows: 3300-3500 (s, br); 3000 (m); 2225 (s); 1680 (s). The correct… · 2000-2022
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
ABC26OR0958 · In the UV-visible is spectrum, a diterpenoid exhibited lambda max =275 nm. The compound, among the choices given below is · JUNE 2013
ABC26OR0959 · In the broad band decoupled 13C NMR spectrum, the number of signals appearing for the two pyrene diols A and B (A) (B) · JUNE 2013
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
ABC26OR0730 · An organic compound Q exhibited the following spectral data: IR: 1760 cm-1 1 H NMR: delta (ppm) : 7.2(1 H, d, J=16.0 Hz), 5.1(1 H, m)… · 2000-2022
ABC26OR0731 · The correct order of IR stretching frequency of the C=C in the following olefins is (I) (II) (III) · 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
ABC26OR0738 · The spectroscopic data for an organic compound with molecular formula C10 H12 O2 are given below. IR band around 1750 cm-1. 1 H NMR delta… · 2000-2022
ABC26OR0739 · the elimination product of the following reaction is · 2000-2022
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
ABC26OR0999 · The number of 1H NMR signals observed for the following compound is · JUNE 2019
UV Vis
ABC26OR0124 · In the UV-visible is spectrum, a diterpenoid exhibited a lambda max =275 nm. The compound, among the choices given below is · JUNE 2013