Practice Questions

Q38.Functional group present in sulphonic acids is : (1) −SO4H (2) −SO3H (3) (4) −SO2 JEE Main 2024 (06 Apr Shift 1) JEE Main Previous Year Paper

Q38.Given below are two statements : Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. Statement (II) : In this titration phenolphthalein can be used as indicator. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement I and Statement II are correct (2) Statement I is correct but Statement II is incorrect (3) Statement I is incorrect but Statement II is (4) Both Statement I and Statement II are incorrect correct

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

Q38.Common name of Benzene - 1, 2 - diol is - (1) catechol (2) o-cresol (3) quinol (4) resorcinol

Q38.Number of σ and π bonds present in ethylene molecule is respectively : (1) 4 and 1 (2) 5 and 2 (3) 3 and 1 (4) 5 and 1

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.Chromatographic technique/s based on the principle of differential adsorption is/are A. Column chromatography B. Thin layer chromatography C. Paper chromatography Choose the most appropriate answer from the options given below: (1) B only (2) A only (3) A & B only (4) C only

Q38.Which among the following has highest boiling point? (1) CH3CH2CH2CH3 (2) CH3CH2CH2CH2 - OH (3) CH3CH2CH2CHO (4) H5C2 - O - C2H5

Q38.The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is: (1) electromeric energy (2) resonance energy (3) ionization energy (4) hyperconjugation energy JEE Main 2024 (29 Jan Shift 1) JEE Main Previous Year Paper

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

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.The quantity which changes with temperature is: (1) Molarity (2) Mass percentage (3) Molality (4) Mole fraction

Q38.Match List I with List II LIST I (Technique) LIST II (Application) A. Distillation I. Separation of glycerol from spent-lye B. Fractional distillation II. Aniline - Water mixture C. Steam distillation III. Separation of crude oil fractions D. Distillation under reduced pressure IV. Chloroform-Aniline Choose the correct answer from the options given below: (1) A-IV, B-I, C-II, D-III (2) A-IV, B-III, C-II. D-I (3) A-I. B-II, C-IV, D-III (4) A-II, B-III. C-I, D-IV

Q39.The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in the vapour phase. A suitable method for the extraction of these oils from the flowers is: (1) crystallisation (2) distillation under reduced pressure (3) distillation (4) steam distillation

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

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.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.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)

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.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.The set of meta directing functional groups from the following sets is: (1) -CN, - NH2, - NHR, - OCH3 (2) -NO2, - NH2, - COOH, - COOR (3) -NO2, - CHO, - SO3H, - COR (4) -CN, - CHO, - NHCOCH3, - COOR