167 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26OR0658 · The major product formed in the following reaction sequence is (i) LDA, -78°C · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0659 · The major product of the following reaction is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0660 · The major product formed in the following reaction is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0662 · The major product P of the following reaction is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0664 · Pick the major product P in the following reaction (ii) KHCO3, acetone, 40°C [CbzCl is PhCH2OCOCl] · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0666 · The result of the reduction of either (R) or (S) 2-methylcyclohexanone, in separate reactions, using LiAlH4 is that the reduction of · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0671 · The major product of the following reaction is: · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0673 · In the reaction sequence [X] the major product respectively, are: · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0674 · In the reaction sequence the major products X and Y, respectively are · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0675 · In the reaction, the major products, [X] and [Y], respectively, are · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0676 · In the reaction sequence [X] [Y] the major products, [X] and [Y] respectively, are · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0677 · In the following reaction (i) 2 eq. n-BuLi (ii) DMF [X] the major product [X] is: · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0678 · The most appropriate sequence of reactions for carrying out the following conversion is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0681 · Identify the product from the following reaction Product · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0686 · The overall yield (in%) for the following reaction sequence is ____ Ph-CHO · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0687 · The most suitable reagent combination to effect the following conversion is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0690 · The mass spectrum of a dihalo compound shows peaks with relative intensities of 1:2:1 corresponding to M, M+2 and M+4 (M is the mass of the… · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0694 · For the following three alkenes, 1, 2, and 3, the rates of hydrogeneation using Wilkinson's catalyst at 20°C vary in the order 1 2 3 · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0695 · Hydroboration of 2 - butyne with (C6 H11)2 BH yields the intermediate U, which on treatment with I2 and NaOMe at -78° C, gives product V… · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0697 · The major product in the following reaction sequence is (i) mCPBA, NaHCO3 · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0698 · The major product formed in the following reaction sequence is · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0699 · Character table of point group D8 is given below Value of (a+b+c+d+e+f+g+h+i+j+k) is equal to ____ · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0701 · Absolute stereochemistry of the given compound is: · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0702 · Major product formed in the following reaction is: · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0703 · Major product formed in the following synthetic sequence is: · Reagents, Reaction Mechanisms & Named Reactions – 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% of… · Reagents, Reaction Mechanisms & Named Reactions – General
ABC26OR0705 · 1H NMR spectrum of [18]– annulene shows · Organic 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… · Organic Spectroscopy – General
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) ~… · Organic Spectroscopy – General
ABC26OR0710 · Match the observed principal absorptions in the visible spectrum shown List – I with the bond show this absorption in List – II List – I… · Organic Spectroscopy – General
ABC26OR0712 · The direction of rotation of the following thermal electrocyclic ring closures.; ⇌; respectively is: · Organic 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… · Organic Spectroscopy – General
ABC26OR0716 · The number of signals that appear in the broad-band decoupled 13C NMR spectrum of ortho-, meta-and para-dichlorobenzenes, respectively, are · Organic Spectroscopy – General
ABC26OR0726 · In the proton decoupled 13C NMR spectrum of 7-norbornanone, the number of signals obtained is · Organic Spectroscopy – General
ABC26OR0727 · The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH3Br) in the mass spectrum is: · Organic Spectroscopy – General
ABC26OR0728 · The number of signals that appear in the proton decoupled 13C NMR spectrum of benzonitrile (C7H5N) is · Organic 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: · Organic 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)… · Organic Spectroscopy – General
ABC26OR0731 · The correct order of IR stretching frequency of the C=C in the following olefins is (I) (II) (III) · Organic 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… · Organic 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… · Organic Spectroscopy – General
ABC26OR0735 · The m/z value of the detectable fragment formed by McLafferty like rearrangement of the following compound in mass spectrometer is ____ · Organic 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… · Organic Spectroscopy – General
ABC26OR0737 · The 13C NMR spectrum of acetone – d6 has a signal at 30 ppm as a septet in the intensity ratio · Organic 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… · Organic Spectroscopy – General
ABC26OR0739 · the elimination product of the following reaction is · Organic Spectroscopy – General
ABC26OR0740 · Major product formed in the following reaction sequence is: · Organic 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… · Organic 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