321 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26OR0700 · In the following reaction sequence, the products P and Q are · Reagent – General
ABC26OR0701 · Absolute stereochemistry of the given compound is: · Reagent – General
ABC26OR0702 · Major product formed in the following reaction is: · Reagent – General
ABC26OR0703 · Major product formed in the following synthetic sequence is: · Reagent – General
ABC26OR0704 · In a company, 35 \% of the employees drink coffee, 40 \% of the employees drink tea and 10 \% of the employees drink both and coffee. What… · Reagent – General
ABC26OR0705 · 1 H NMR spectrum of [18]- annulene shows · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0707 · Match the compounds in List-I with the stretching frequencies ( cm-1 ) of the principal functional groups given in List- II List-I List-II… · Spectroscopy – General
ABC26OR0708 · Which of the following set of characteristic NMR signals iwll be compatible with the structure of P in the above reaction? · Spectroscopy – General
ABC26OR0709 · Match the structure in List - I with the coupling constant [ 1 H J(Hz) ] given in List -II List - I List - II (1) (i) ~ 1Hz (2) (ii) ~ 10… · Spectroscopy – General
ABC26OR0710 · Match the observed principal absoprtions in the visible spectrum shown List-I with the bond show this absorp tion in List - II List - I… · Spectroscopy – General
ABC26OR0711 · Among the isomers C10 H14 shown, the isomer that can be identified uniquely by mass spectrometry alone is: · Spectroscopy – General
ABC26OR0712 · The direction of rotation of the following thermal electrocyclic ring closures. respectively is: · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0714 · The most probable fragmentation observed in the electron impact ionization (EI) mass spectrometry is: · Spectroscopy – General
ABC26OR0715 · The product P shows ' m ' and ' n ' number of signals in 1 H and 13 C NMR spectra, respectively. The values of ' m ' and 'n' are · Spectroscopy – General
ABC26OR0716 · The number of signals that appear in the broad-band decoupled 13 C NMR spectrum of ortho-, meta-and para- dichlorobenzenes, respectively… · Spectroscopy – General
ABC26OR0717 · In the photochemical reaction formation of the compound X can be inferred by the disappearance of the 1 H NMR signal at 1 H NMR spectrum of… · Spectroscopy – General
ABC26OR0718 · Compounds Y and Z , respectively, are · Spectroscopy – General
ABC26OR0719 · Compound Y and Z can be differentiated by carrying out basic hydrolysis, because · Spectroscopy – General
ABC26OR0720 · The metal - ion along with its oxidation state and the number of unpaired electron present are · Spectroscopy – General
ABC26OR0721 · The complex is Common Data for Q. 50 and Q. 51 An organic compound [X] (C12 H16 O3 ) exhibits the following spectral data IR : -1720 cm-1 1… · Spectroscopy – General
ABC26OR0722 · The compound [X] is: · Spectroscopy – General
ABC26OR0723 · The compound [Y] is: · Spectroscopy – General
ABC26OR0724 · The compound [X] is: · Spectroscopy – General
ABC26OR0725 · The major product [Y] is: · Spectroscopy – General
ABC26OR0726 · In the proton decoupled 13 C NMR spectrum of 7 -norbornanone, the number of signals obtained is · Spectroscopy – General
ABC26OR0727 · The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH3 Br ) in the mass spectrum is: · Spectroscopy – General
ABC26OR0728 · The number of signals that appear in the proton decoupled 13 C NMR spectrum of benzonitrile (C7 H5 N ) is · Spectroscopy – General
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: · Spectroscopy – General
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)… · Spectroscopy – General
ABC26OR0731 · The correct order of IR stretching frequency of the C=C in the following olefins is (I) (II) (III) · Spectroscopy – General
ABC26OR0732 · The set of protons (underlined) in CH3 CH2 CH2 OCH3 that would exhibit different splitting patterns in high ( 500 MHz) and low (60 MHz)… · Spectroscopy – General
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… · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0735 · The m/z value of the detectable fragment formed by McLafferty like rearrangement of the following compound in mass spectrometer is ____ · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0737 · The 13 C NMR spectrum of acetone -d6 has a signal at 30 ppm as a septet in the intensity ratio · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0739 · the elimination product of the following reaction is · Spectroscopy – General
ABC26OR0740 · Major product formed in the following reaction sequence is: · Spectroscopy – General
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… · Spectroscopy – General
ABC26OR0742 · Amongst the following amino acids, the (R)-enantiomer is represented by · Stereochemistry – General
ABC26OR0743 · The configurations at the three chiral centres in the bicyclodecanol given below, are · Stereochemistry – General
ABC26OR0744 · The absolute configurations of the two chiral centers in the following molecule are · Stereochemistry – General
ABC26OR0745 · Among the following, the Newmann projections of meso-2, 3-butanediol are · Stereochemistry – General
ABC26OR0746 · The configurations at the two asymmetric centres ( C-1 and C-6 ) in the bicyclo [4.4.0] decane, given below are · Stereochemistry – General
ABC26OR0747 · Esterification of the acid P with the alcohol Q will give (S)-P ( )-Q · Stereochemistry – General
ABC26OR0748 · Among the following, the most stable isomer for 3 - methoxycyclohexanol is: · Stereochemistry – General
ABC26OR0749 · The decreasing order of nucleophilicity for the following anions is CH3 CO2-, CH3 O-, C6 H4 O-, NO3- · Stereochemistry – General