Practice Questions

Q35.Example of vinylic halide is (1) (2) (3) (4)

Q35. KMnO4 decomposes on heating at 513 K to form O2 along with (1) MnO2 & K2O2 (2) K2 MnO4 & Mn (3) Mn & KO2 (4) K2 MnO4 & MnO2

Q35.The incorrect statement regarding conformations of ethane is: (1) Ethane has infinite number of conformations (2) The dihedral angle in staggered conformation is 60° (3) Eclipsed conformation is the most stable (4) The conformations of ethane are interconvertible conformation. to one-another

Q35.Methods used for purification of organic compounds are based on : (1) nature of compound and presence of impurity. (2) neither on nature of compound nor on the impurity present. (3) nature of compound only. (4) presence of impurity only.

Q36.Match List - I with List - II. List - I Compound List-II Use (A) Carbon tetrachloride (I) Paint remover (B) Methylene chloride (II) Refrigerators and air conditioners (C) DDT (III) Fire extinguisher (D) Freons (IV) Non Biodegradable insecticide Choose the correct answer from the options given below: (1) (A)-(I), (B), (II), (C)-(III), (D)-(IV) (2) (A)-(III), (B)-(I), (C)-(IV), (D)-( II) (3) (A)-(IV), (B)-(III), (C)-(II), (D)-(I) (4) (A)-( II), (B)-(III), (C)-(I), (D)-(IV)

Q36.Given below are two statement one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A): CH2 = CH −CH2 −Cl is an example of allyl halide Reason (R): Allyl halides are the compounds in which the halogen atom is attached to sp2 hybridised carbon atom. JEE Main 2024 (30 Jan Shift 1) JEE Main Previous Year Paper In the light of the two above statements, choose the most appropriate answer from the options given below: (1) (A) is true but (R) is false (2) Both (A) and (R) are true but (R) is not the correct explanation of A (3) (A) is false but (R) is true (4) Both (A) and (R) are true and (R) is the correct explanation of (A)

Q36. X ⇌Y; K1 = 1.0 For the given hypothetical reactions, the equilibrium constants are as follows : Y ⇌Z; K2 = 2.0 The Z ⇌W; K3 = 4.0 equilibrium constant for the reaction X ⇌W is (1) 6.0 (2) 12.0 (3) 7.0 (4) 8.0

Q36.The technique used for purification of steam volatile water immiscible substance is: (1) Fractional distillation (2) Fractional distillation under reduced pressure (3) Distillation (4) Steam distillation

Q36.The equilibrium constant for the reaction SO3(g) ⇌SO2( g) + 12 O2( g) is Kc = 4.9 × 10−2 . The value of Kc for the reaction given below is 2SO2( g) + O2( g) ⇌2SO3( g) is : (1) 4.9 (2) 49 (3) 41.6 (4) 416

Q36.The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal Fe2O3( s) + 3CO(g) ⇌Fe(l) + 3CO2( g) Using the Le-chatelier's principle, predict which one of the following will not disturb the equilibrium. (1) Addition of CO2 (2) Removal of CO2 (3) Addition of Fe2O3 (4) Removal of CO

Q36.The correct stability order of carbocations is (1) + + + (2) + + + + CH33C+ > CH3 - CH2 > CH32 CH > CH3 CH3 > CH32 CH > CH3 - CH2 > CH33 C (3) + + + + (4) $\stackrel{+\quad} CH33 C > CH32 CH > CH3 - CH2 > CH3 {\mathrm{C}\mathrm{H}_3}>\mathrm{CH}_3- \stackrel{+ \quad}{\mathrm{C} \mathrm{H}_2}>\mathrm{CH}_3-\underset{| \atop \stackrel{ \atop }{\huge \mathrm{CH}_3}} {\stackrel{+ \quad}{\mathrm{C} \mathrm{H}}}>\left(\mathrm{CH}_3\right) \mathrm{C}^{+}$

Q36.Match List I with List II Choose the correct answer from the options given below: (1) A-I, B-II, C-III, D-IV (2) A-IV, B-I, C-II, D-III (3) A-III, B-IV, C-I, D-II (4) A-II, B-I, C-IV, D-III

Q36.The incorrect statement regarding ethyne is (1) The C −C bonds in ethyne is shorter than that in (2) Both carbons are sp hybridised ethene (3) Ethyne is linear (4) The corbon - carbon bonds in ethyne is weaker than that in ethene

Q37.Given below are two statements: Statement I: IUPAC name of HO - CH2 - ( CH2 ) - CH2 - COCH3 is 7-hydroxyheptan-2-one. 3 Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for the above compound. 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 incorrect. incorrect. (3) Both Statement I and Statement II are correct. (4) Statement I is incorrect but Statement II is correct. JEE Main 2024 (31 Jan Shift 1) JEE Main Previous Year Paper

Q37.The interaction between π bond and lone pair of electrons present on an adjacent atom is responsible for (1) Hyperconjugation (2) Inductive effect (3) Electromeric effect (4) Resonance effect

Q37.For a sparingly soluble salt AB2 , the equilibrium concentrations of A2+ ions and B− ions are 1.2 × 10−4M and 0.24 × 10−3M, respectively. The solubility product of AB2 is : (1) 6.91 × 10−12 (2) 0.276 × 10−12 (3) 27.65 × 10−12 (4) 0.069 × 10−12

Q37. IUPAC name of following compound (P) is : JEE Main 2024 (27 Jan Shift 1) JEE Main Previous Year Paper (1) 1 −Ethyl −5, 5 −dimethylcyclohexane (2) 3 −Ethyl −1, 1 −dimethylcyclohexane (3) 1 −Ethyl −3, 3 −dimethylcyclohexane (4) 1, 1 −Dimethyl −3 −ethylcyclohexane

Q37. IUPAC name of following hydrocarbon (X) is : (1) 2-Ethyl-3,6-dimethylheptane (2) 2,5,6-Trimethyloctane (3) 3,4,7-Trimethyloctane (4) 2-Ethyl-2,6-diethylheptane

Q37.Which among the following is incorrect statement? (1) Electromeric effect dominates over inductive (2) The electromeric effect is, temporary effect effect (3) Hydrogen ion (H+)shows negative electromeric (4) The organic compound shows electromeric effect effect in the presence of the reagent only.

Q38.If a substance '𝐴' dissolves in solution of a mixture of ' 𝐵' and ' 𝐶 ' with their respective number of moles as 𝑛𝐴, 𝑛𝐵 and 𝑛𝐶, mole fraction of 𝐶 in the solution is: JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper nC nC (1) (2) nA × nB × nC nA + nB + nC (3) nC (4) nB nA - nB - nC nA + nB

Q38.Number of σ and π bonds present in ethylene molecule is respectively : (1) 4 and 1 (2) 5 and 2 (3) 3 and 1 (4) 5 and 1

Q38.Functional group present in sulphonic acids is : (1) −SO4H (2) −SO3H (3) (4) −SO2 JEE Main 2024 (06 Apr Shift 1) JEE Main Previous Year Paper

Q38.The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is: (1) electromeric energy (2) resonance energy (3) ionization energy (4) hyperconjugation energy JEE Main 2024 (29 Jan Shift 1) JEE Main Previous Year Paper

Q38.The quantity which changes with temperature is: (1) Molarity (2) Mass percentage (3) Molality (4) Mole fraction

Q38.How can an electrochemical cell be converted into an electrolytic cell? (1) Applying an external opposite potential lower (2) Reversing the flow of ions in salt bridge. than E0 cell. (3) Applying an external opposite potential greater (4) Exchanging the electrodes at anode and cathode. than E0 cell-