425 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0793 · The correct order of the ionic radii is: · Periodic Properties – General
ABC26IN0794 · The correct valence shell electronic configuration of the element with atomic number 22 is · Periodic Properties – General
ABC26IN0795 · The decreasing order of the first ionization energy of the following element is · Periodic Properties – General
ABC26IN0796 · The decreasing order of ionic nature of the following compound is: · Periodic Properties – General
ABC26IN0797 · The compound having the highest melting point is: · Periodic Properties – General
ABC26IN0798 · The decreasing order of the first ionization energy of the following elements is: · Periodic Properties – General
ABC26OR0771 · Arrange the following in the decreasing order of acidity of the hydrogen indicated in italic (i) CH3 COCH3 (ii) CH3 COCH2 COCH3 (iii) CH3… · Acidity Basicity
ABC26OR0772 · The increasing order of the acidity of the hydrogen marked in bold italics among the following is: I II III · Acidity Basicity
ABC26OR0773 · The value of 'n' for the following molecule according to Huckel's rule is · Aromaticity
ABC26OR0774 · The correct order of acidity among (i) (ii) (iii) (iv) ; is · Acidity Basicity
ABC26OR0775 · The correct statement describing the relationship between ; is · Inductive Resonance Effects
ABC26OR0776 · Which of the following are aromatic? P Q R S · Aromaticity
ABC26OR0777 · Arrange the following in the correct order of acidity of the hydrogen indicated in bold. P Q R · Acidity Basicity
ABC26OR0778 · The product P and Q in the following reactions, respectively, are · General Organic Chemistry – General
ABC26OR0779 · The species/compounds that are aromatic among the following are P Q R S · Aromaticity
ABC26OR0780 · Electrophilic nitrations of the following compounds follow the trend P Q R S · General Organic Chemistry – General
ABC26OR0781 · calixene Calixene is a polar hydrocarbon with a high dipole moment. The most stable dipolar canonical structure is ____ · General Organic Chemistry – General
ABC26OR0782 · The Correct order of stability of the following carbonium ions is (I) (II) (III) · Carbocation Stability
ABC26OR0783 · The homolytic breaking of the Ca-Cb bond is easiest in: · General Organic Chemistry – General
ABC26OR0784 · Which of the following species is/are aromatic in nature? · Aromaticity
ABC26OR0785 · The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is (I) (II) (III) (IV) · Acidity Basicity
ABC26OR0786 · Among the following, the number of molecules that are aromatic is ____ . · Aromaticity
ABC26OR0787 · The correct order of pKa for the following compounds is (I) (II) (III) (IV) · Acidity Basicity
ABC26OR0788 · The correct statement(s) about the following species is(are) (I) (II) (III) · Stereochemistry R S E Z
ABC26OR0789 · Among the following, the number of aromatic compound(s) is · Aromaticity
ABC26OR0790 · The compound that contains the most acidic hydrogen is · Acidity Basicity
ABC26OR0791 · The correct order of stability for the following carbocations is I II III IV · Carbocation Stability
ABC26OR0792 · In the scheme shown above (P), (Q), (R) and (S) are · Natural Products & – General
ABC26OR0793 · Match the isoelectric point with the amino acids. · Natural Products & – General
ABC26OR0794 · A dipeptide on hydrolysis gives two amino acids (X) and (Y). If the dipeptide is first treated with HNO2 and then hydrolysis is carried… · Natural Products & – General
ABC26OR0795 · The complementary strand of DNA for the following single stranded DNA sequence, 5-A-T-C-A-T-G-C-3 is · Natural Products & – General
ABC26OR0796 · 5(a) For the following scheme of transformations, draw the structures of A, B, C and D. (b) Complete hydrolysis of a pentapeptide with 6N… · Natural Products & – General
ABC26OR0797 · A disaccharide K gives a silver mirror with Tollen's reagent. Treatment of K with MeOH / HCl gives a monomethyl derivative L , which does… · Natural Products & – General
ABC26OR0798 · The structure of D-galactose is Which one of these structures is L-galactose? · Natural Products & – General
ABC26OR0799 · Predict the product in each of the following reactions. · Natural Products & – General
ABC26OR0800 · Calculate the isoelectric point (p.I.) of lysine, given the pKa of alpha .NH3 is 8.95, pKa of side chain NH3 is 10.53 and pKa of alpha… · Natural Products & – General
ABC26OR0801 · The absolute configurations at the two chiral centers in D-Ribulose are · Natural Products & – General
ABC26OR0802 · The correct relationship within each pair of the natural products is: · Natural Products & – General
ABC26OR0803 · The INCORRECT statement in the following is: · Natural Products & – General
ABC26OR0804 · The Haworth projection for alpha -anomer of D-glucose is · Natural Products & – General
ABC26OR0805 · The complementary DNA sequence of the given DNA 5'-G-A-A-T-T-C-3' is: · Natural Products & – General
ABC26OR0806 · The correct C3 epimeric pair of the following is · Natural Products & – General
ABC26OR0807 · alpha -Farnesene shown below is a · Natural Products & – General
ABC26OR0808 · Write the structure of E, F and G in the following scheme of reactions. · Natural Products & – General
ABC26OR0809 · Given below are structure of some natural products. Identify them as vitamin A, B6, C and D and classify them according to their classes… · Natural Products & – General
ABC26OR0810 · Which one of the following statements is Correct? · Natural Products & – General
ABC26OR0811 · Tollen's test will be negative for: · Natural Products & – General
ABC26OR0812 · Which one among the following is a sesquiterpene? · Natural Products & – General
ABC26OR0813 · Specific rotations of freshly prepared aqueous solutions of I and II are +112 and +18.7, respectively. On standing the optical rotation of… · Natural Products & – General
ABC26OR0814 · The pKa values of lysine are 2.18, 8.95 and 10.79. The isoelectric point of lysine is ____ · Natural Products & – General