Basics Of Organic Reaction Mechanism — Part 1 MCQs with Explanations

C6H5O- > CH3O- > N$${\text{O}}_3^ - $$ > CH3C$${\text{O}}_2^ - $$ is the correct answer to “The decreasing order of nucleophilicity for the following anions is CH 3 C$${\text{O}}_2^ - $$, CH 3 O - , C 6 H 5 O - , N$${\text{O}}_3^ - $$”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

(i) O3/Me2S, (ii) NaOEt, (iii) N2H4/KOH is the correct answer to “The most appropriate sequence of the reactions for carrying out the following conversion is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

CH3CONHC6H5 is the correct answer to “Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in 1 H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D 2 O”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

diazotisation followed by reaction with CuCN is the correct answer to “Conversion of Ph-NH 2 into Ph-CN can be accomplished by”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

R, S is the correct answer to “The absolute configuration for compounds X and Y respectively are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

Cl2C: is the correct answer to “The reactive intermediate involved in the conversion of phenol to salicylaldehyde using chloroform and sodium hydroxide is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

X > Y > Z is the correct answer to “Order of reactivity of the following dienes X, Y and Z in Diels-Alder reaction is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

an optically active compound with (S)-configuration is the correct answer to “The binaphthol (Bnp) is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

(i) NaNO2/HCl, 0-5°C (ii) alkaline β naphthol is the correct answer to “Aniline can be distinguished from methyl amine by its reaction with”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

2E, 4S is the correct answer to “For the compound, the stereochemical notations are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

two peaks at δ 9.0 (12H) and δ - 3.0 (6H) is the correct answer to “1 H NMR spectrum of [18]-annulene shows”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

1-methylcyclohexanol is the correct answer to “Oxymercuration-demercuration reaction of t-methylcyclohexene gives”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

Ha and Hb : enantiotopic is the correct answer to “Identify the correct stereochemical relationship amongst the hydrogen atoms H a , H b and H c in the following molecule”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

only one enantiomer is the correct answer to “Esterification of the acid P with the alcohol Q will give”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

amino acids is the correct answer to “Proteins are biopolymers. The monomer units present in them are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

Q and S is the correct answer to “The acylanion equivalents among the following compounds (P-S) are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

I and III are anomers; I and II are epimers is the correct answer to “Identify the correct set of stereochemical relationships amongst the following monosaccharides I-IV”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

3-hexyne is the correct answer to “(E)-3-bromo-3-hexene when treated with CH 3 O - in CH 3 OH gives”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

S, S is the correct answer to “The configurations of the reactant and the product in the following reaction, are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

2(R), 3(R) is the correct answer to “The absolute configurations of two chiral centres in the following molecule are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

formaldehyde and benzaldehyde is the correct answer to “Among formaldehyde, acetaldehyde and benzaldehyde, the aldehydes which undergo Cannizzaro's reaction are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

hexanal is the correct answer to “1-hexyne upon treatment with disiamylborane followed by the oxidation with H 2 O 2 gives”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

1R, 2S, 6R is the correct answer to “The configurations at the three chiral centres in the bicyclodecanol given below, are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

P, Q, S is the correct answer to “For the aldotetroses I-IV, the combination of true statements, among P-T, is P = I and II are diastereomers and II and III are enantiomers Q = I and IV are mesomers and are optically inactive R = I and III can be interconverted by a base catalysed isomerisation S = only I and IV are HlO 4 cleavable T = I and III are D-sugars and II and IV are L-sugars”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

C6H5COC6H5 is the correct answer to “Which one of the following molecules will have n → \[\mathop \pi \limits^ * \] transition at the longest wavelength”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

IV > III > I > II is the correct answer to “The correct order of-the basicity of the following compounds is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

ortho, meta and para hydroxyacetophenones is the correct answer to “Reaction of phenyl acetate with anhydrous aluminium chloride generates a mixture of”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

3.25 is the correct answer to “The pK a values for the three ionisable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively The isoelectric point for the amino acid is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

1-butyne is the correct answer to “Among the isomers of C 4 H 6 given below, the compound which exhibits an absorption band at 3300 cm -1 in the IR spectrum, is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

benzylbromide is the correct answer to “Toluene when refluxed with Br 2 in the presence of light mainly gives”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

P-IV, Q-III, R-V, S-II is the correct answer to “Match the compounds P-S with their carbonyl stretching frequencies (cm -1 ) I-VI in IR spectroscopy. P. Acetone I. 1870 Q. Ethyl acetate II. 1800 R. Acetamide III. 1740 S. Acetyl chloride IV. 1700 V. 1660 VI. 1600”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

III > II > I is the correct answer to “The decreasing order of acidity of the marked H of the following molecules is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

naphthalene-2-sulphonic acid is the correct answer to “On heating with dilute sulphuric acid, naphthalene-1 sulphonic acid gives predominantly”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

[Ph3P(Me)] [I]; Ph3P=CH2 is the correct answer to “In the reaction, \[P{h_3}P\xrightarrow{{\,\,{\text{Mel}}\,\,}}\left[ X \right]\xrightarrow{{n - {\text{BuLi}}}}\left[ Y \right]\] the compounds X and Y, respectively, are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

carboxylate for Ca2+ and imidazole for Cu2+ is the correct answer to “The amino acid side chain high affinity for Ca 2+ and Cu 2+ in metallo-proteins is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

I > II > III is the correct answer to “The decreasing order of the reactivity of the following compounds towards electrophiles is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

4π-electrocyclization followed by [4 + 2] π-cycloaddition is the correct answer to “The two pericyclic reactions successively involved in the thermal transformation given below are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

a, e is the correct answer to “Bridge-head hydrogen of the conformer of cis-decalin is positioned as [a = axial; e = equatorial]”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

aromatic and high dipole moment is the correct answer to “The compound is”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.

P, R is the correct answer to “Among the following, the Newman projections of meso-2, 3-butanediol are”. This question is standard in competitive examination syllabi for Basics Of Organic Reaction Mechanism.