Practice Questions

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

Q59.A doctor prescribed the drug Equanil to a patient. The patient was likely to have symptoms of which disease? (1) Stomach ulcers (2) Hyperacidity (3) Anxiety and stress (4) Depression and hypertension

Q59.Match List I with List II : List I List II A. Saccharin I. High potency sweetener B. Aspartame II. First artificial sweetening agent C Alitame III. Stable at cooking temperature D. Sucralose IV. Unstable at cooking temperature Choose the correct answer from the options given below : JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper (1) A-IV, B-III, C-I, D-II (2) A-II, B-III, C-IV, D-I (3) A-II, B-IV, C-III, D-I (4) A-II, B-IV, C-I, D-III

Q59.The product (P) formed from the following multistep reaction is: (1) (2) (3) (4)

Q59.Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions (1) Lead sulphate (2) Lead nitrate (3) Lead chromate (4) Lead iodide

Q60.Match List-I with List-II. List-I List-II Natural Amino One Letter acid Code (A) Arginine (I) D (B) Aspartic acid (II) N (C) Asparagine (III) A (D) Alanine (IV) R Choose the correct answer from the options given below: JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper (1) (A)–IV, B–I, (C)–II, (D)–III (2) (A)–I, B–III, (C)–IV, (D)–II (3) (A)–III, B–I, (C)–II, (D)–IV (4) (A)–IV, B–I, (C)–III, (D)–II

Q60.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): α-halocarboxylic acid on reaction with dil. NH3 gives good yield of α-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides. Reason (R): Amino acids exist in zwitter ion form in aqueous medium. In the light of the above statements, choose the correct answer from the options given below : (1) Both (A) and (R) are correct and (R) is the (2) Both (A) and (R) are correct but (R) is not the correct 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.

Q60.Number of moles of AgCl formed in the following reaction is _____ . JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper

Q60.Match the following Column −A Column −B a. Nylon 6 I. Natural Rubber b. Vulcanized Rubber II. Cross Linked c. cis −1, 4−polyisoprene III. Caprolactam d. Polychloroprene IV. Neoprene Choose the correct answer from options given below: (1) a →III, b →II, c →I, d →IV (2) a →III, b →IV, c →I, d →II (3) a →IV, b →III, c →II, d →I (4) a →II, b →III, c →IV, d →I ¯

Q60.Total number of tripeptides possible by mixing of valine and proline 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.The difference in the oxidation state of Xe between the oxidised product of Xe formed on complete hydrolysis of XeF4and XeF4 is 2𝑧- 3𝑖

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

Q60.A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The number of peptide linkages in it are _____ .

Q60.The homoleptic and octahedral complex of Co2+ and H2O has ______ unpaired electron(s) in the t2g set of orbitals.

Q60.Given below are two statements: Statement I: Ethane at 333 to 343 K and 6 −7 atm pressure in the presence of AlEt3 and TiCl4 undergoes addition polymerization to give LDP. Statement II: Caprolactam at 533 −543 K in H2O through step growth polymerizes to give Nylon 6. In the light of the above statements, choose the correct answer from the options given below: (1) Statement I is false but Statement II is true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

Q60.In potassium ferrocyanide, there are ______ pairs of electrons in the t2g set of orbitals. 2𝑧- 3𝑖

Q60.Match List I with List II List II List I One Letter Natural amino acid Code (A) Glutamic acid (I) Q (B) Glutamine (II) W (C) Tyrosine (III) E JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper (D) Tryptophan (IV) Y Choose the correct answer from the options given below: (1) (A)-III, B-IV, (C)-I, (D)-II (2) (A)-IV, B-III, (C)-I, (D)-II (3) (A)-III, B-I, (C)-IV, (D)-II (4) (A)-II, B-I, (C)-IV, (D)-III

Q60.A ( g ) →2 B ( g ) + C ( g ) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600 mm Hg after 10 min. The total pressure of the system after 30 min will be mm Hg. (Nearest integer)

Q60.Number of ambidentate ligands in a representative metal complex M ( en ) ( SCN ) is _________ . [en = 4 ethylenediamine]

Q60.An athlete is given 100 g of glucose (C6H12O6) for energy. This is equivalent to 1800 kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of energy, the weight of extra water he would need to perspire is _____g (Nearest integer) Assume that there is no other way of consuming stored energy. Given : The enthalpy of evaporation of water is 45 kJ mol−1 Molar mass of C, H&O are 12.1 and 16 g mol−1 .

Q60.Number of cyclic tripeptides formed with 2 amino acids A and B is: (1) 2 (2) 3 (3) 5 (4) 4

Q60.Following tetrapeptide can be represented as JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper ( F, L, D, Y, I, Q, P are one letter codes for amino acids) (1) FIQY (2) FLDY (3) YQLF (4) PLDY

Q60.A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Polychlorinated biphenyls act as cleansing solvents. D. ‘Blue baby’ syndrome occurs due to the presence of excess of sulphate ions in water. JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below:- (1) A, B and C only (2) B and C only (3) A and D only (4) A and C only

Q60.Sulphur (S) containing amino acids from the following are: (a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid (1) b, c, e (2) a, b, c (3) b, d (4) a, d