Practice Questions

Q38.Compound A formed in the following reaction reacts with B gives the product C. Find out A and B. (1) A = CH3 −C ≡C−Na+, B = CH3 −CH2 −CH2 −Br (2) A = CH3 −CH = CH2, B = CH3 −CH2 −CH2 −Br (3) A = CH3 −CH2 −CH3, B = CH3 −C ≡CH (4) A = CH3 −C ≡C−Na+, B = CH3 −CH2 −CH3

Q38. Identify (B) and (C) and how are (A) and (C) related ? (1) (2) (3) (4)

Q38.The correct stability order of the following resonance structures of CH3 −CH = CH −CHO is (1) I > II > III (2) II > III > I (3) II > I > III (4) III > II > I

Q38.Thiosulphate reacts differently with iodine and bromine in the reactions given below: 2 S2O2−3 + I2 →S4O2−6 + 2I− Which of the following statement justifies the above dual S2O2−3 + 5Br2 + 5H2O →2SO2−4 + 4Br−+ 10H+ behaviour of thiosulphate? (1) Bromine is a stronger oxidant than iodine (2) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reaction (3) Bromine is a weaker oxidant than iodine (4) Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Q38. List - I List - II (Pair of compounds) (Isomerism) (A) n-propanol and Isopropanol (I) Metamerism Match List I with List II Choose the (B) Methoxypropane and ethoxyethane (II) Chain Isomerism (C) Propanone and propanal (III) Position Isomerism (D) Neopentane and Isopentane (IV) Functional Isomerism correct answer from the options given below : (1) (A)-(II), (B)-(I), (C)-(IV), (D)-(III) (2) (A)-(III), (B)-(I), (C)-(II), (D)-(IV) (3) (A)-(I), (B)-(III), (C)-(IV), (D)-(II) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q38.Relative stability of the contributing structures is : (1) (I) > (II) > (III) (2) (I) > (III) > (II) (3) (II) > (I) > (III) (4) (III) > (II) > (I)

Q39.Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO4 in presence of concentrated H2 SO4 indicates the presence of element/s (1) Br (2) N (3) N and S (4) S

Q39.Which of the following statements is not correct about rusting of iron? JEE Main 2024 (27 Jan Shift 2) JEE Main Previous Year Paper (1) Coating of iron surface by tin prevents rusting, (2) When pH lies above 9 or 10 , rusting of iron does even if the tin coating is peeling off. not take place. (3) Dissolved acidic oxides SO2, NO2 in water act as (4) Rusting of iron is envisaged as setting up of catalyst in the process of rusting. electrochemical cell on the surface of iron object.

Q39.Identify A and B in the given chemical reaction sequence : JEE Main 2024 (05 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q39.The product (C) in the below mentioned reaction is: KOHalc HBr ∆ CH3 - CH2 - CH2 - Br →∆ A → B →KOHaq C (1) Propan-1-ol (2) Propene (3) Propyne (4) Propan-2-ol

Q39.Which of the following statements are correct? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. Aniline can be purified by steam distillation as aniline is miscible in water. C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope. D. An organic compound is pure, if mixed M.P. is remained same. Choose the most appropriate answer from the options given below : (1) A, B, C only (2) A, C, D only (3) A, B, D only (4) B, C, D only

Q39.The solution from the following with highest depression in freezing point/lowest freezing point is (1) 180 g of acetic acid dissolved in 1 L of (2) 180 g of acetic acid dissolved in benzene aqueous solution. (3) 180 g of benzoic acid dissolved in benzene (4) 180 g of glucose dissolved in water

Q39.In the given reactions identify the reagent A and reagent B (1) A −CrO3 B −CrO3 (2) A − CrO3 B −CrO2 Cl2 (3) A −CrO2 Cl2 B −CrO2 Cl2 (4) A −CrO2 Cl2 B −CrO3

Q39. Total number of stereo isomers possible for the given structure : (1) 2 (2) 4 (3) 3 (4) 8

Q39.In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is : (1) Na3PO4 ⋅12MoO3 (2) (NH4)3PO4 ⋅12MoO3 (3) MoPO4.21NH4NO3 (4) (NH4)3PO4 ⋅12(NH4)2MoO4

Q39.Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D) Ti (E) Mn Choose the correct answer from the options given below : (1) (A) < (D) < (C) < (B) < (E) (2) (C) < (E) < (B) < (A) < (D) (3) (A) < (D) < (C) < (E) < (B) (4) (B) < (C) < (D) < (E) < (A)

Q39.Which of the following has highly acidic hydrogen? (1) (2) (3) (4)

Q39.Identify the product A and product B in the following set of reactions. (1) (2) A - CH3CH2CH3 B −CH3CH2CH3 (3) A −CH3CH2CH2 −OH B −CH3CH2CH2 −OH (4)

Q40.Identify product A and product B (1) (2) (3) (4)

Q40. Which of the following are aromatic? (1) A and C only (2) B and D only (3) C and D only (4) A and B only

Q40. Product P is JEE Main 2024 (04 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q40.The ascending order of acidity of – OH group in the following compounds is : (A) Bu – OH Choose the correct answer from the options given below : (1) (A) < (D) < (C) < (B) < (E) (2) (C) < (A) < (D) < (B) < (E) (3) (C) < (D) < (B) < (A) < (E) (4) (A) < (C) < (D) < (B) < (E)

Q40.The correct IUPAC name of [PtBr2(PMe3)2] is : (1) dibromodi(trimethylphosphine)platinum(II) (2) bis(trimethylphosphine)dibromoplatinum(II) (3) dibromobis(trimethylphosphine)platinum(II) (4) bis[bromo(trimethylphosphine)]platinum(II)

Q40.Identify the mixture that shows positive deviations from Raoult's Law (1) ( CH3 ) 2CO + C6H5NH2 (2) CHCl3 + C6H6 ) (3) CHCl3 + ( CH3 ) 2CO (4) ( CH3 2CO + CS2

Q40.Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning : JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper 2 = 0 (2) Λ2mC −KaΛ∘2m + KaΛmΛm = 0 (1) Λm −Λ0m + AC 1 2 = 0 (3) Λ2mC + KaΛ∘2m −KaΛmΛ∘m = 0 (4) Λm −Λ∘m −AC 1