Practice Questions

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

Q39.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cis form of alkene is found to be more polar than the trans form. Reason (R): Dipole moment of trans isomer of 2-butene is zero. In the light of the above statements, choose the correct answer from the options given below : (1) (A) is false but (R) is true (2) Both (A) and (R) are true and (R) is the correct explanation of (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

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.The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is : (Given : Molar Mass Na : 23 and Cl : 35.5gmol−1 ) (1) 2 (2) 20 (3) 4 (4) 0.2

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

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.Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The stability order of +1 oxidation state of Ga, In and T1 is Ga < In < T1. Reason R: The inert pair effect stabilizes the lower oxidation state down the group. In the light of the above statements, choose the correct answer from the options given below: JEE Main 2024 (08 Apr Shift 1) JEE Main Previous Year Paper (1) A is true but R is false. (2) A is false but R is true. (3) Both A and R are true and R is the correct (4) Both A and R are true but R is NOT the correct explanation of A . explanation of A .

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.Anomalous behaviour of oxygen is due to its (1) Large size and high electronegativity (2) Small size and low electronegativity (3) Small size and high electronegativity (4) Large size and low electronegativity

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.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.Given below are two statements: Statement (I) : Aminobenzene and aniline are same organic compounds. Statement (II) : Aminobenzene and aniline are different organic compounds. 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

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.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.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.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.The adsorbent used in adsorption chromatography is/are - A. silica gel B. alumina C. quick lime D. magnesia Choose the most appropriate answer from the options given below : (1) A only (2) B only (3) C and D only (4) A and B only

Q40.The emf of cell Tl Tl+ Cu2+ Cu is 0.83 V at 298 K. It could be increased by : (0.001M) (0.01M) (1) decreasing concentration of both Tl+ and Cu2+ (2) increasing concentration of Cu2+ ions ions (3) increasing concentration of T1+ ions (4) increasing concentration of both Tl+ and Cu2+ ions

Q40.Which of the following acts as a strong reducing agent? (Atomic number : Ce = 58, Eu = 63, Gd = 64, Lu = 71) (1) Lu3+ (2) Gd3+ (3) Eu2+ (4) Ce4+

Q40.Given below are two statements: Statement (I) : Oxygen being the first member of group 16 exhibits only – 2 oxidation state. Statement (II) : Down the group 16 stability of +4 oxidation state decreases and +6 oxidation state increases. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are correct incorrect (3) Both Statement I and Statement II are incorrect (4) Statement I is incorrect but Statement II is correct

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.What pressure (bar) of H2 would be required to make emf of hydrogen electrode zero in pure water at 25∘C ? (1) 10−7 (2) 0.5 (3) 1 (4) 10−14

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