Practice Questions

Q63.The major product of the following reaction is: CH3CH2CH = O → ? reflux (1) (2) (3) (4)

Q63. Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(IV), (D)-(I) (2) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (4) (A)-(III), (B)-(II), (C)-(IV), (D)-(I)

Q63. The products formed in the following reaction sequence are : (1) (2) , CH3 −CHO , CH3 −COOH (3) (4) , CH3 −CHO

Q63.Total number of sigma ( σ ) and pi(π) bonds respectively present in hex-1-en-4-yne are : (1) 3 and 13 (2) 11 and 3 (3) 13 and 3 (4) 14 and 3

Q64.Assume a living cell with 0.9%(ω/ω) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water. (Consider the data upto first decimal place only) The cell will : (1) show no change in volume since solution is (2) shrink since solution is 0.5%(ω/ω) 0.9%(ω/ω) (3) swell up since solution is 1%(ω/ω) (4) None of these

Q64.Ice at −5∘C is heated to become vapor with temperature of 110∘C at atmospheric pressure. The entropy change associated with this process can be obtained from 2025 (23 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q64.Consider a binary solution of two volatile liquid components 1 and 2. x1 and y1 are the mole fractions of component 1 in liquid and vapour phase, respectively. The slope and intercept of the linear plot of 1 vs 1 x1 y1 are given respectively as: P02−P01 (1) P0 P02−P01 (2) P0 2 , 1 , P01 P02 P02 P02 P01−P02 (3) P0 P01−P02 (4) P0 1 , 2 , P02 P02 P01 P02

Q64.How many different stereoisomers are possible for the given molecule? (1) 2 (2) 1 (3) 4 (4) 3

Q64. Residue (A) + HCl (dil) → Compound (B) Structure of residue (A) and compound (B) formed respectively is : (1) (2) (3) (4)

Q64.Which of the following statement is true with respect to H2O, NH3 and CH4 ? A. The central atoms of all the molecules are sp3 hybridized. B. The H −O −H, H −N −H and H −C −H angles in the above molecules are 104.5∘, 107.5∘ and 109.5∘ , respectively. C. The increasing order of dipole moment is CH4 < NH3 < H2O. D. Both H2O and NH3 are Lewis acids and CH4 is a Lewis base. E. A solution of NH3 in H2O is basic. In this solution NH3 and H2O act as Lowry-Bronsted acid and base respectively. Choose the correct answer from the options given below: (1) A, B and C Only (2) A, D and E Only (3) C, D and E Only (4) A, B, C and E Only

Q64.The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is (1) Mn2+ (2) Cr3+ (3) Ni2+ (4) Ti3+

Q64.First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family : (1) 1402 kJ mol−1 (2) 834 kJ mol−1 (3) 1012 kJ mol−1 (4) 947 kJ mol−1

Q65.Which one of the carbocations from the following is most stable? (1) (2) (3) (4) 2025 (24 Jan Shift 1) JEE Main Previous Year Paper

Q65.The ascending order of relative rate of solvolysis of following compounds is : (1) (C) < (B) < (A) < (D) (2) (D) < (A) < (B) < (C) (3) (D) < (B) < (A) < (C) (4) (C) < (D) < (B) < (A) 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

Q65.The structure of the major product formed in the following reaction is : 2025 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q65.A vessel at 1000 K contains CO2 with a pressure of 0.5 atm . Some of CO2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm , then Kp is : (1) 1.8 atm (2) 0.3 atm (3) 3 atm (4) 0.18 atm

Q65. The compounds that produce CO2 with aqueous NaHCO3 solution are: A. B. C. D. E. Choose the correct answer from the options given below: (1) A, C and D Only (2) A, B and E Only (3) A and C Only (4) A and B Only

Q65.The incorrect statement among the following is options 1 . (1) PH3 shows lower proton affinity than NH3 . (2) SO2 can act as an oxidizing agent, but not as a reducing agent. (3) PF3 exists but NF5 does not. (4) NO2 can dimerise easily. Q66. 2.8 × 10−3 mol of CO2 is left after removing 1021 molecules from its ' x ' mg sample. The mass of CO2 taken initially is Given: NA = 6.02 × 1023 mol−1 (1) 98 .3 mg (2) 48.2 mg (3) 196 .2 mg (4) 150 .4 mg

Q65.The alkane from below having two secondary hydrogens is : (1) 4-Ethyl-3,4-dimethyloctane (2) 2,2,3,3-Tetramethylpentane (3) 2,2,4,5-Tetramethylheptane (4) 2,2,4,4-Tetramethylhexane

Q66.Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with H −Br(aq) at the fastest rate? (1) R (2) P (3) Q (4) S

Q66. For reaction The correct order of set of reagents for the above conversion is : (1) Br2 ∣FeBr3, H2O(Δ), NaOH (2) H2SO4, Ac2O, Br2, H2O(Δ), NaOH (3) Ac2O, Br2, H2O(Δ), NaOH (4) Ac2O, H2SO4, Br2, NaOH

Q66.Match List - I with List - II. List −I List −II (A) Bronze (I) Cu, Ni (B) Brass (II) Fe, Cr, Ni, C (C) UKsilvercoin (III) Cu, Zn (D) Stainlesssteel (IV ) Cu, Sn Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(II), (C)-(III), (D)-(I) (2) (A)-(IV), (B)-(III), (C)-(I), (D)-(II) (3) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q66.A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is [Given : molar mass of aluminium and chlorine are 27 g mol−1 and 35.5 g mol−1 respectively. Faraday constant = 96500Cmol−1] (1) 1.660 g (2) 0.336 g (3) 0.441 g (4) 1.007 g 2025 (22 Jan Shift 1) JEE Main Previous Year Paper

Q66.Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction? (1) (2) (3) (4)

Q66. Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(II), (C)-(I), (D)-(III) (2) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(II), (B)-(IV), (C)-(III), (D)-(I)