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.
ABC26OR0450 · On heating with dilute sulfuric acid, napththalene-1 sulfonic acid gives predominantly · Heterocyclic Compounds – General
ABC26OR0451 · Identify the major P in the following two-step reaction: -50°C P · Heterocyclic Compounds – General
ABC26OR0456 · The major product of the following reaction is, BF3Et2O, 0 °C · Heterocyclic Compounds – General
ABC26OR0461 · The major product (X) of the monobromination reaction is (X) · Intermediate – General
ABC26OR0462 · The major product obtained upon treatment of compound X with H2SO4 at 80°C is: · Intermediate – General
ABC26OR0464 · In the carbylamine reaction, R-X is converted to R-Y via the intermediate Z. R-X, R-Y and Z, respectively, are · Intermediate – General
ABC26OR0465 · The photochemical reaction of 2-methylpropane with F2 gives 2-fluoro-2-methylpropane and 1-fluoro-2-methylpropane in 14:86 ratio. The… · Intermediate – General
ABC26OR0466 · The major product of the following reaction is · Intermediate – General
ABC26OR0472 · In the reaction sequence, [X] the structure of the major product Z and the overall yield for its formation from the ketone X, are · Intermediate – General
ABC26OR0473 · In the reaction, [X] the major product [X] is: · Intermediate – General
ABC26OR0477 · In the following reaction, [X] the major product [X] is: · Intermediate – General
ABC26OR0478 · Identify the most probable product in the given reaction Product · Intermediate – General
ABC26OR0479 · The major product formed in the reaction given below is: · Intermediate – General
ABC26OR0482 · The major product formed in the following reaction is · Intermediate – General
ABC26OR0484 · Major product formed in the following transformation is · Intermediate – General
ABC26OR0485 · beta -D-Glucose is represented as · Natural Products & – General
ABC26OR0487 · Which one of the following compunds will form as osazone derivative? · Natural Products & – General
ABC26OR0488 · D-Glucose and D-fructose interconvert into each other in aqueous alkaline solution. Suggest a mechanism for the interconversion. · Natural Products & – General
ABC26OR0489 · Proteins are biopolymers. The monomer units present in them are · Natural Products & – General
ABC26OR0491 · For the aldotetroses I-IV, the combination of TRUE statements, among P - T, is: I II III IV P = I and II are diastereomers and II and III… · Natural Products & – General
ABC26OR0492 · Three molecular ionic states, P - R, are possible for the amino acid histidine. Identify the correct choice of pH values, respectively, for… · Natural Products & – General
ABC26OR0493 · The pKa values for the three ionizable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively. The isoelectric point for the… · Natural Products & – General
ABC26OR0494 · contain a Statement with a Reason and an Assertion. For each question, choose the correct answer from the following four choices… · Natural Products & – General
ABC26OR0496 · Match the following compounds with their respective classes. I. II. III. IV. · Natural Products & – General
ABC26OR0497 · Identify the Correct set of stereochemical relationships amongst the following monosaccharides I-IV I II III IV · Natural Products & – General
ABC26OR0498 · Select the correct pair of statements: (I) Complementary strands run antiparallel in a double stranded DNA. (II) The triplet codons… · Natural Products & – General
ABC26OR0499 · Sucrose is converted to a mixture of glucose and fructose in a pseudo first order process under alkaline condi tions. The reaction has a… · Natural Products & – General
ABC26OR0501 · Treatment of the pentapeptide Gly-Arg-Phe-Ala-Ala, in separate experiments, with the enzymes Trypsin, Chemotrypsin and Carboxypeptidase A… · Natural Products & – General
ABC26OR0502 · In the reaction, (X) + Acetone + 2 Formaldehyde Compound X is · Natural Products & – General
ABC26OR0504 · Cyanogen bromide (CNBr) specifically hydrolyses the peptide bond formed by the C–side of · Natural Products & – General
ABC26OR0505 · In the following reaction, D - Glyceraldehyde X + Y (2 diastereomers) The absolute configurations of the chiral centres in X and Y are · Natural Products & – General
ABC26OR0506 · In the two steps reaction sequence: the major product Y is: · Natural Products & – General
ABC26OR0508 · The decreasing order of isoelectric point for the following alpha -amino acids is Lysine (I), Alanine (II), Glutamic acid (III) · Natural Products & – General
ABC26OR0510 · The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'–AGCTACACT–3' is · Natural Products & – General
ABC26OR0511 · Number of thymine residues in a 5000 kb DNA containing 23% guanine residues is: · Natural Products & – General
ABC26OR0512 · A disaccharide that will not given Benedict's test and will not form osazone is · Natural Products & – General
ABC26OR0514 · The correct sequence of the amino acids present in the tripeptide given below is · Natural Products & – General
ABC26OR0515 · The major product of the following reaction is 2. HCl, H2O · Natural Products & – General
ABC26OR0516 · Amongst the following, the structure of guanosine is · Natural Products & – General
ABC26OR0517 · The compound given below is a (Hirsutene) · Natural Products & – General
ABC26OR0519 · A tetrapeptide, made up of natural amino acids, has alanine as the N-terminal residue which is coupled to a chiral amino acid. Upon… · Natural Products & – General
ABC26OR0520 · Major product formed in the given reaction is: · Natural Products & – General
ABC26OR0521 · A correct example of a nucleotide is: · Natural Products & – General
ABC26OR0522 · A tripeptide on treatment with PhNCS (pH = 8.0) followed by heating with dilute HCl afforded a cyclic compound M and a dipeptide. The… · Natural Products & – General
ABC26OR0524 · The products formed in the following reaction are + → · Organic Synthesis – General
ABC26OR0527 · Reaction of phenylacetylene with sodamide in liquid ammonia generates · Organic Synthesis – General
ABC26OR0529 · Reaction of ethyl acetoacetate with one equivalent of methylmagnesium bromide gives · Organic Synthesis – General
ABC26OR0530 · The major product P of the following reaction is · Organic Synthesis – General
ABC26OR0531 · Which of the statement is CORRECT about the mechanism of the following reaction? · Organic Synthesis – General
ABC26OR0534 · The reaction, benzene + 2Na + 2C₂H₅OH —(Liq. NH₃)→ cyclohexa-1,4-diene + 2C₂H₅ONa is an example of a · Organic Synthesis – General