Practice Questions

Q54.The total number of compounds from below when treated with hot KMnO4 giving benzoic acid is : (1) 6 (2) 3 (3) 5 (4) 4

Q54.The element that does not belong to the same period of the remaining elements (modern periodic table) is: 2025 (23 Jan Shift 1) JEE Main Previous Year Paper (1) Iridium (2) Platinum (3) Osmium (4) Palladium

Q54.A molecule (" P ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" R "). The structure of (" R ") is given below. The structure of (" P′′ ) is (1) (2) (3) (4) 2025 (28 Jan Shift 1) JEE Main Previous Year Paper

Q54.When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be : (1) Violet → Blue → Pale Blue → Green (2) Pale Blue → Blue → Green → Violet (3) Green → Pale Blue → Blue → Violet (4) Pale Blue → Blue → Violet → Green

Q54.Identify the homoleptic complexes with odd number of d electrons in the central metal : (A) [FeO4]2− (B) [Fe(CN)6]3− (C) [Fe(CN)5NO]2− (D) [CoCl4]2− (E) [Co(H2O)3 F3] Choose the correct answer from the options given below : (1) (A), (B) and (D) only (2) (C) and (E) only (3) (B) and (D) only (4) (A), (C) and (E) only

Q54.Given below are two statements : Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode. Statement (II) : The rate of corrosion is more in alkaline medium than in acidic medium. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false 2025 (22 Jan Shift 2) JEE Main Previous Year Paper

Q54.An element ' E ′ has the ionisation enthalpy value of 374 kJ mol−1 . ' E ' reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol−1 , respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is : (1) ED > EC > EB > EA (2) EA > EB > EC > ED (3) EB > EA > EC > ED (4) ED > EC > EA > EB

Q54.Which of the following electronegativity order is incorrect? (1) Mg < Be < B < N (2) S < Cl < O < F (3) Al < Si < C < N (4) Al < Mg < B < N

Q55. Consider the given figure and choose the correct option : (1) Activation energy of both forward and backward (2) Activation energy of forward reaction is E1 + E2 reaction is E1 + E2 and reactant is more stable and product is less stable than reactant. than product. (3) Activation energy of backward reaction is E1 and (4) Activation energy of forward reaction is E1 + E2 product is more stable than reactant. and product is more stable than reactant.

Q55.Match the LIST-I with LIST-II Choose the correct answer from the options given below: (1) A-IV, B-I, C-III, D-II (2) A-IV, B-II, C-I, D-III (3) A-II, B-IV, C-III, D-I (4) A-III, B-II, C-I, D-IV

Q55.Total number of nucleophiles from the following is : ⊖ NH3, PhSH, (H3C)2 S, H2C = CH2, O H, H3O⊕, (CH3)2CO, ⇌NCH3 (1) 7 (2) 4 (3) 6 (4) 5

Q55.Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct? (1) acetophenone < benzaldehyde < p-tolualdehyde (2) benzaldehyde < acetophenone < p- < p- nitrobenzaldehyde nitrobenzaldehyde < p-tolualdehyde (3) p- nitrobenzaldehyde < benzaldehyde < p- (4) acetophenone < p-tolualdehyde < benzaldehyde tolualdehyde < acetophenone < p- nitrobenzaldehyde

Q55.Consider the reaction X2Y( g) = X2( g) + 12 Y2( g) The equation representing correct relationship between the degree of dissociation (x) of X2Y(g) with its equilibrium constant Kp is ______ . Assume x to be very very small. (1) (2) x = 3√2Kpp x = 3√2Kp2p (3) (4) x = 3√Kpp x = 3√Kp2p 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

Q55.Which one of the following, with HBr will give a phenol? 2025 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.Given below are two statements : Statement (I) : The first ionization energy of Pb is greater than that of Sn . Statement (II) : The first ionization energy of Ge is greater than that of Si . 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

Q55.Lanthanoid ions with 4f 7 configuration are : (A) Eu2+ (B) Gd3+ (C) Eu3+ (D) Tb3+ (E) Sm2+ Choose the correct answer from the options given below : (1) (A) and (D) only (2) (B) and (C) only (3) (A) and (B) only (4) (B) and (E) only

Q55.The correct order of stability of following carbocations is : (1) C > B > A > D (2) A > B > C > D (3) B > C > A > D (4) C > A > B > D

Q55.Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(I), (B)-(IV), (C)-(III), (D)-(II) (2) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) (3) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) (4) (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Q56.Identify correct statement/s : (A) −OCH3 and −NHCOCH3 are activating group. (B) -CN and -OH are meta directing group. (C) -CN and −SO3H are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below : (1) (A) only (2) (A), (B) and (E) only (3) (A) and (C) only (4) (A), (C) and (D) only

Q56.Given below are two statements : Consider the following reaction (1) Both Statement I and Statement II are false (2) Statement I is true but Statement II is false (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are true

Q56.Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option. (1) Both ΔH and ΔS are (-ve) (2) ΔH is (-ve) but ΔS is (+ve) (3) ΔH is (+ve) but ΔS is (−ve) (4) Both ΔH and ΔS are (+ve)

Q56. The maximum number of RBr producing 2-methylbutane by above sequence of reactions is ________ - (Consider the structural isomers only) (1) 5 (2) 4 (3) 3 (4) 1

Q56.The products A and B in the following reactions, respectively are Ag−NO2 AgCN −A ⟷CH3 −CH2 −CH2 −Br → B (1) CH3 −CH2 −CH2 −NO2, CH3 −CH2 −CH2 −CN (2) CH3 −CH2 −CH2 −ONO, CH3 −CH2 −CH2 −NC (3) CH3 −CH2 −CH2 −ONO, CH3 −CH2 −CH2 −CN (4) CH3 −CH2 −CH2 −NO2, CH3 −CH2 −CH2 −NC

Q56. The steam volatile compounds among the following are : (A) (B) (C) (D) Choose the correct answer from the options given below : (1) (B) and (D) Only (2) (A) and (C) Only (3) (A), (B) and (C) Only (4) (A) and (B) Only

Q56.Identify correct statements : (A) Primary amines do not give diazonium salts when treated with NaNO2 in acidic condition. (B) Aliphatic and aromatic primary amines on heating with CHCl3 and ethanolic KOH form 2025 (28 Jan Shift 2) JEE Main Previous Year Paper carbylamines. (C) Secondary and tertiary amines also give carbylamine test. (D) Benzenesulfonyl chloride is known as Hinsberg's reagent. (E) Tertiary amines reacts with benzenesulfonyl chloride very easily. Choose the correct answer from the options given below : (1) (A) and (B) only (2) (D) and (E) only (3) (B) and (D) only (4) (B) and (C) only