Practice Questions

Q58.Number of compounds from the following which will not dissolve in cold NaHCO3 and NaOH solutions but will dissolve in hot NaOH solution is _____ . JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper

Q59.All structures given below are of vitamin C. Most stable of them is: (1) (2) (3) (4)

Q59.The volume (in mL) of 0. 1 M AgNO3 required for complete precipitation of chloride ions present in 20 mL of 0. 01 M solution of [Cr (H2O)5 Cl] Cl2 as silver chloride is_______

Q60. The ratio x/y on completion of the above reaction is ______ . JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper 𝑥- 7 2

Q60.Compound A, C5H10O5 , given a tetraacetate with AC2 O and oxidation of A with Br2 −H2O gives an acid, C5H10O6 . Reduction of A with HI gives isopentane. The possible structure of A is : JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q60.Number of isomeric compounds with molecular formula C9H10O which (i) do not dissolve in NaOH (ii) do not dissolve in HCl. (iii) do not give orange precipitate with 2, 4 - DNP (iv) on hydrogenation give identical compound with molecular formula C9H12O is

Q61.If the solution of the equation 1, 𝑥∈0, 𝜋 is sin-1𝛼+ √𝛽 , where 𝛼, 𝛽 are integers, logcos𝑥cot𝑥+ 4logsin𝑥tan𝑥= 2 2 then 𝛼+ 𝛽 is equal to: (1) 3 (2) 5 (3) 6 (4) 4 -2

Q62.Let 𝑆= 𝑧∈ℂ: ¯𝑧= 𝑖𝑧2 + Re ( ¯𝑧) . Then ∑𝑧∈𝑆| 𝑧| 2 is equal to (1) 5 (2) 4 2 (3) 7 (4) 3 2

Q32.Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron? (A) NO (B) N2 (C) O2 (D) C2 (E) B2 Choose the most appropriate answer from the options given below : (1) A, B, C only (2) B, C, E only (3) A, C only (4) D only JEE Main 2022 (25 Jun Shift 1) JEE Main Previous Year Paper

Q37.Product ' A ' of following sequence of reactions is (1) (2) (3) (4)

Q37. L-isomer of a compound ′A′(C4H8O4)gives a positive test with [Ag (NH3)2]+ . Treatment of ' A' with acetic anhydride yields triacetate derivative. Compound ' A' produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and HNO3 respectively. Compound (A) is : (1) (2) (3) (4)

Q38.Among the following marked proton of which compound shows lowest pKa value? (1) (2) (3) (4)

Q38.The ( ∂T∂E )P of different types of half cells are as follows : A B C D 1 × 10−4 2 × 10−4 0. 1 × 10−4 0. 2 × 10−4 (Where E is the electromotive force). Which of the above half cells would be preferred to be used as reference electrode (1) A (2) B (3) C (4) D

Q38.In the given reaction sequence, the major product ' C' is : HNO3 Br2 alcoholic −−C8H10 → A → B → C H2 SO4 Δ KOH JEE Main 2022 (24 Jun Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : [6] Annulene. [8] Annulene and cis −[10] Annulene, are respectively aromatic, not-aromatic and aromatic. ​ Reason R: Planarity is one of the requirements of aromatic systems. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Both A and R are correct and R is the correct (2) Both A and R are correct but R is NOT the explanation of A . correct explanation of A . (3) A is correct but R is not correct. (4) A is not correct but R is correct.

Q39.Which of the following reagents / reactions will convert ' A' to ' B'? (1) PCC oxidation (2) Ozonolysis (3) BH3, H2O2/ −OH followed by PCC oxidation (4) HBr, hydrolysis followed by oxidation by K2 Cr2 O7 .

Q40.Consider the following reaction : (1) Electrolysis 2 HSO−4 (aq) (2) Hydrolysis 2 HSO−4 + 2H+ + A The dihedral angle in product A in its solid phase at 110 K is (1) 104° (2) 111. 5° (3) 90. 2° (4) 111. 0°

Q40.The correct order of reduction potentials of the following pairs is A. Cl2 / Cl- B. I2 / I- C. Ag+ / Ag D. Na+ / Na E. Li+ / Li Choose the correct answer from the options given below. (1) A > B > C > E > D (2) A > C > B > E > D (3) A > B > C > D > E (4) A > C > B > D > E

Q40.The photochemical smog does not generally contain (1) NO (2) NO2 (3) SO2 (4) HCHO

Q43.Given below are two statements : JEE Main 2022 (28 Jun Shift 1) JEE Main Previous Year Paper Statement I: [Ni (CN)4]2− is square planar and diamagnetic complex, with dsp2 hybridization for Ni but [Ni (CO)4] is tetrahedral, paramagnetic and with sp3 hybridication for Ni. Statement II : [NiCl4]2− and [Ni (CO)4] both have same d-electron configuration, have same geometry and are paramagnetic. In light the above statements, choose the correct answer form the options given below (1) Both Statement I and Statement II are true. (2) Statement I is correct but statement II is false. (3) Statement I is incorrect but statement II is true. (4) Both Statement I and Statement II are false.

Q44.Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn = 25; Fe = 26) A. [FeF6]3− B. [Fe (CN)6]3− C. [MnCl6]3− (high spin) D. [Mn (CN)6]3− Choose the correct answer from the options given below (1) A < B < D < C (2) B < D < C < A (3) A < C < D < B (4) B < D < A < C

Q45.The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is (1) LiAlH4 (2) KMnO4 (3) MnO (4) NaBH4

Q45.Two isomers (A) and (B) with Molar mass 184 g/ mol and elemental compositio C, 52. 2%; H, 49% and Br 42. 9% gave benzoic acid and p− bromobenzoic acid, respectively on oxidation with KMnO4 . Isomer ′A′ is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO3 . Isomer ′A′ and ′B′ are, respectively : (1) (2) (3) (4) H3C −CHBr −C6H5 and and H3C −CHBr −C6H5

Q46.Isobutyraldehyde on reaction with formaldehyde and K2 CO3 gives compound ' A '. Compound ' A' reacts with KCN and yields compound ' B ', which on hydrolysis gives a stable compound ' C '. The compound ' C ' is (1) (2) (3) (4)

Q46.Decarboxylation of all six possible forms of diaminobenzoic acids C6H3(NH2)2 COOH yields three products A, B and C . Three acids give a product ' A ', two acids gives a product ' B ' and one acid give a product ' C '. The melting point of product ' C ' is (1) 63 °C (2) 90 °C (3) 104 °C (4) 142 °C