Practice Questions

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.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.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)

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.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.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

Q56.What amount of bromine will be required to convert 2 g of phenol into 2,4,6-tribromophenol? (Given molar mass in gmol−1 of C, H, O, Br are 12, 1, 16, 80 respectively ) (1) 20 .44 g (2) 4.0 g (3) 6.0 g (4) 10.22

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.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.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

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.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

Q57.The species which does not undergo disproportionation reaction is : (1) ClO−3 (2) ClO− (3) ClO−2 (4) ClO−4

Q57. The compounds which give positive Fehling's test are : (A) (B) (C) HOCH2 −CO −(CHOH)3 −CH2 −OH (D) (E) Choose the correct answer from the options given below : (1) (A), (D) and (E) Only (2) (C), (D) and (E) Only (3) (A), (C) and (D) Only (4) (A), (B) and (C) Only

Q57.In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. n = 1, l = 0, m1 = 0 B. n = 2, l = 0, m1 = 0 C. n = 2, l = 1, m1 = 1 D. n = 3, l = 2, m1 = 1 E. n = 3, l = 2, m1 = 0 Choose the correct answer from the options given below: (1) B and C Only (2) A and B Only (3) C and D Only (4) D and E Only

Q57.Preparation of potassium permanganate from MnO2 involves two step process in which the 1st step is a reaction with KOH and KNO3 to produce (1) K3MnO4 (2) K4 [Mn(OH)6] (3) KMnO4 (4) K2MnO4

Q57.Match List - I with List - II : Choose the correct answer from the options given below : (1) (A)-(III), (B)-(II), (C)-(IV), (D)-(I) (2) (A)-(II), (B)-(III), (C)-(IV), (D)-(I) (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

Q57. E∘Cr2O2−7 /Cr3+ = 1.33 V E∘Cl2/Cl(−) = 1.36 V Based on the data given below : the strongest reducing agent is : E∘ = 1.51 V E∘ = −0.74 V MnO−4 /Mn2+ Cr3+/Cr (1) Cr (2) Cl− (3) MnO−4 (4) Mn2+

Q58.Standard electrode potentials for a few half cells are mentioned below : E∘ = 0.34 V, E∘ = −0.76 V Cu2+/Cu Zn2+/Zn Which one of the following cells gives the most negative value of E∘Ag+/Ag = 0.80 V, E∘Mg2+/Mg = −2.37 V ΔG∘ ? (1) Zn Zn2+(1M) Ag+(1M) Ag (2) Zn Zn2+(1M) Mg2+(1M) Mg (3) Ag Ag+(1M) Mg2+(1M) Mg (4) Cu Cu2+(1M)∥Ag+(1M) Ag

Q58.The molar solubility(s) of zirconium phosphate with molecular formula (Zr4+)3(PO3−4 )4 is given by relation : (1) Ksp 13 (2) Ksp 17 ( 9612 ) ( 6912 ) (3) Ksp 17 (4) Ksp 16 ( 8435 ) ( 5348 )

Q58.The correct set of ions (aqueous solution) with same colour from the following is: 2025 (23 Jan Shift 1) JEE Main Previous Year Paper (1) Sc3+, Ti3+, Cr2+ (2) V2+, Cr3+, Mn3+ (3) Ti4+, V4+, Mn2+ (4) Zn2+, V3+, Fe3+

Q58.A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH pKa )? (1) 0 (2) log(1 + 2x) (3) log ( 1−xx ) (4) log ( 1−xx )

Q58.For a reaction, N2O5( g) →2NO2( g) + 12 O2( g) in a constant volume container, no products were present initially. The final pressure of the system when 50% of reaction gets completed is (1) 5 times of initial pressure (2) 5/2 times of initial pressure (3) 7/2 times of initial pressure (4) 7/4 times of initial pressure

Q58.Which of the following electrolyte can be used to obtain H2 S2O8 by the process of electrolysis? (1) Dilute solution of sodium sulphate. (2) Acidified dilute solution of sodium sulphate. (3) Dilute solution of sulphuric acid (4) Concentrated solution of sulphuric acid