Practice Questions

Q42.Consider the reaction sequence given below : Which of the following statements is true: (1) Changing the base from OH⊖ to ⊖OR will have no effect on reaction (2) (2) Changing the concentration of base will have no effect on reaction (1) (3) Doubling the concentration of base will double the rate of both the reactions (4) Changing the concentration of base will have no effect on reaction (2)

Q42.When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are these alkenes? (1) (2) (3) (4) Q43. [P] on treatment with Br2 / FeBr3 in CCl4 produced a single isomer C8H7O2 Br wile heating [P] with sodalime gives toluene. The compound [P] is: (1) (2) (3) (4)

Q42.The lanthanoid that does NOT show + 4 oxidation state is: (1) Dy (2) Ce (3) Eu (4) Tb

Q42.The major product [R] in the following sequence of reaction is : (1) (2) (3) (4)

Q42.The major product of the following reaction is: (1) (2) (3) (4)

Q42.The complex that can show optical activity is : (1) trans −[Cr (Cl2)(Ox)2]3− (2) trans −[Fe (NH3)2(CN)4]− (3) cis −[Fe (NH3)2(CN)4]− (4) cis −[CrCl2 (ox)2]3−(ox = oxalate)

Q42.The compound A in the following reactions is: (i) CH3 MgBr /H2O (i) O3 −−A → B → C + D (ii) Conc. H2 SO4 /Δ (ii) Zn /H2O (1) (2) (3) (4)

Q42.The correct match between Item-I (starting material) and Item-II (reagent) for the preparation of benzaldehyde is : Item-I Item-II (I) Benzene (P) HCl and SnCl2, H3O+ (II) Benzonitrile (Q) H2, Pd −BaSO4, S and quinoline (III) Benzoyl Chloride (R) Co, HCl and AlCl3 (1) (I)-(Q), (II)-(R) and (III)-(P) (2) (I)-(P), (II)-(Q) and (III)-(R) (3) (I)-(R), (II)-(P) and (III)-(Q) (4) (I)-(R), (II)-(Q) and (III)-(P)

Q42.Which of these will produce the highest yield Friedel Crafts reaction? (1) (2) (3) (4)

Q43.The major product [C] of the following reaction sequence will be : JEE Main 2020 (04 Sep Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q43.Two compounds A and B with same molecular formula (C3H6O) undergo Grignard reaction with methylmagnesium bromide to give products C and D . Products C and D show following chemical tests. JEE Main 2020 (02 Sep Shift 2) JEE Main Previous Year Paper Test C D Ceric Positive Positive ammonium nitrate Test Turbidity obtained after Turbidity obtained Lucas Test five minutes Immediately Iodoform Test Positive Negative C and D respectively are (1) (2) (3) (4)

Q43.In the following reaction sequence, structures of A and B are, respectively (1) (2) (3) (4)

Q43.Identify (A) in the following reaction sequence: (1) (2) (3) (4) JEE Main 2020 (09 Jan Shift 1) JEE Main Previous Year Paper

Q43.The decreasing order of basicity of the following amines is: (1) (I) > (III) > (IV) > (II) (2) (III) > (I) > (II) > (IV) (3) (II) > (III) > (IV) > (I) (4) (III) > (II) > (I) > (IV)

Q43.The increasing order of basicity of the following compounds is : (1) (A) < (B) < (C) < (D) (2) (B) < (A) < (D) < (C) (3) (D) < (A) < (B) < (C) (4) (B) < (A) < (C) < (D)

Q43.Which of the following compounds will show retention in configuration on nucleophile substitution by OH−ion ? JEE Main 2020 (02 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q43.Which of the following compounds can be prepared in good yield by Gabriel phthalimide synthesis ? (1) (2) CH3 −CH2 −NHCH3 (3) (4)

Q43.The species that has a spin-only magnetic moment of 5. 9 BM, is : ( Td =tetrahedral) (1) [Ni(CN)4]2− (square planar) (2) [NiCl4]2−(Td) (3) Ni(CO)4(Td) (4) [MnBr4]2−(Td) JEE Main 2020 (06 Sep Shift 1) JEE Main Previous Year Paper

Q43. Three isomers A, B and C (mol. formula C8H11N ) give the following results: Dianotization (i) Hydrolyds −−A and C → P + Q → R (product of A) + S (product of C) (ii) acidation(KMnO4+H+) R has lower boiling point than S C6H5 SO2 Cl −B → alkali-insoluble product JEE Main 2020 (03 Sep Shift 2) JEE Main Previous Year Paper A, B and C, respectively are: (1) (2) (3) (4)

Q43.The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is: (A) Ni(CO)4 (B) [Ni(H2O)6]Cl2 (C) Na2[Ni(CN)4] (D) PdCl2(PPh3)2 (1) (A) ≈(C) < (B) ≈(D) (2) (C) < (D) < (B) < (A) (3) (C) ≈(D) < (B) < (A) (4) (A) ≈(C) ≈(D) < (B)

Q43.What is the product of following reaction? ? (1) (2) (3) (4)

Q43.The mechanism of Sn1 reaction is given as: Y⊖ R −X ⟶R⊕X⊖⟶R⊕ X⊖ →R −Y + X⊖ lon pair Solvent Speparated ion pair A student writes general characteristics based on the given mechanism as : (a) The reaction is favoured by weak nucleophiles. (b) R⊕ would be easily formed if the substituents are bulky y (c) The reaction is accompanied by recemization (d) The reaction is favoured by non-polar solvents. Which observations are correct? (1) (a) and (b) (2) (a) and (c) (3) (a), (b) and (c) (4) (b) and (d)

Q43.The major product of the following reaction is : JEE Main 2020 (05 Sep Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q43.The most suitable reagent for the given conversion is: (1) B2H6 (2) NaBH4 (3) LiAlH4 (4) H2/Pd

Q44.In the following reaction sequence, [C] is : (1) (2) (3) (4)