Practice Questions

Q37.The correct nomenclature for the following compound is : (1) 2-formyl-4-hydroxyhept-7-enoic acid (2) 2-formyl-4-hydroxyhept-6-enoic acid (3) 2-carboxy-4-hydroxyhept-7-enal (4) 2-carboxy-4-hydroxyhept-6-enal

Q37.The incorrect statement regarding the geometrical isomers of 2-butene is : (1) cis-2-butene and trans-2-butene are not (2) cis-2-butene and trans-2-butene are interconvertible at room temperature. stereoisomers. (3) cis-2-butene has less dipole moment than trans-2- (4) trans-2-butene is more stable than cis-2-butene. butene. JEE Main 2024 (06 Apr Shift 2) JEE Main Previous Year Paper

Q37.Product A and B formed in the following set of reactions are: (1) (2) (3) (4)

Q37.Given below are two statements : Statement I: Group 13 trivalent halides get easily hydrolysed by water due to their covalent nature. Statement II: AlCl3 upon hydrolysis in acidified aqueous solution forms octahedral AlH2O6 3 + ion. In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is true but statement II is false (2) Statement I is false but statement II is true (3) Both statement I and statement II are false (4) Both statement I and statement II are true

Q37. Correct order of stability of carbanion is - (1) d > a > c > b (2) a > b > c > d (3) d > c > b > a (4) c > b > d > a

Q37.Given below are two statements: Statement (I) : SiO2 and GeO2 are acidic while SnO and PbO are amphoteric in nature. Statement (II) : Allotropic forms of carbon are due to property of catenation and pπ - dπ bond formation. 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 false (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Statement I is true but Statement II is true

Q37.In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction JEE Main 2024 (01 Feb Shift 1) JEE Main Previous Year Paper Cr2O72 - + XH+ + Ye- →2 A + ZH2O X, Y, Z and A are respectively are: (1) 8, 6, 4 and Cr2O3 (2) 14, 7, 6 and Cr3 + (3) 8, 4, 6 and Cr2O3 (4) 14, 6, 7 and Cr3 +

Q37.At −20∘C and 1 atm pressure, a cylinder is filled with equal number of H2, I2 and HI molecules for the reaction H2( g) + I2( g) ⇌2HI(g), the Kp for the process is x × 10−1 . x = _____ [Given : R = 0.082 L atm K−1 mol−1 ] (1) 0.01 (2) 10 (3) 2 (4) 1

Q38.Thiosulphate reacts differently with iodine and bromine in the reactions given below: 2 S2O2−3 + I2 →S4O2−6 + 2I− Which of the following statement justifies the above dual S2O2−3 + 5Br2 + 5H2O →2SO2−4 + 4Br−+ 10H+ behaviour of thiosulphate? (1) Bromine is a stronger oxidant than iodine (2) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reaction (3) Bromine is a weaker oxidant than iodine (4) Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Q38. Identify (B) and (C) and how are (A) and (C) related ? (1) (2) (3) (4)

Q38.Relative stability of the contributing structures is : (1) (I) > (II) > (III) (2) (I) > (III) > (II) (3) (II) > (I) > (III) (4) (III) > (II) > (I)

Q38.The correct stability order of the following resonance structures of CH3 −CH = CH −CHO is (1) I > II > III (2) II > III > I (3) II > I > III (4) III > II > I

Q38.Given below are two statements : Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. Statement (II) : In this titration phenolphthalein can be used as indicator. 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

Q38.Identify structure of 2, 3-dibromo-1-phenylpentane. (1) (2) (3) (4)

Q38. List - I List - II (Pair of compounds) (Isomerism) (A) n-propanol and Isopropanol (I) Metamerism Match List I with List II Choose the (B) Methoxypropane and ethoxyethane (II) Chain Isomerism (C) Propanone and propanal (III) Position Isomerism (D) Neopentane and Isopentane (IV) Functional Isomerism correct answer from the options given below : (1) (A)-(II), (B)-(I), (C)-(IV), (D)-(III) (2) (A)-(III), (B)-(I), (C)-(II), (D)-(IV) (3) (A)-(I), (B)-(III), (C)-(IV), (D)-(II) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q38.Given below are two statements : Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine. Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method. 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) Both Statement I and Statement II are false (3) Statement I is false but Statement II is true (4) Statement I is true but Statement II is false

Q38.Match List I with List II LIST I (Technique) LIST II (Application) A. Distillation I. Separation of glycerol from spent-lye B. Fractional distillation II. Aniline - Water mixture C. Steam distillation III. Separation of crude oil fractions D. Distillation under reduced pressure IV. Chloroform-Aniline Choose the correct answer from the options given below: (1) A-IV, B-I, C-II, D-III (2) A-IV, B-III, C-II. D-I (3) A-I. B-II, C-IV, D-III (4) A-II, B-III. C-I, D-IV

Q38.Compound A formed in the following reaction reacts with B gives the product C. Find out A and B. (1) A = CH3 −C ≡C−Na+, B = CH3 −CH2 −CH2 −Br (2) A = CH3 −CH = CH2, B = CH3 −CH2 −CH2 −Br (3) A = CH3 −CH2 −CH3, B = CH3 −C ≡CH (4) A = CH3 −C ≡C−Na+, B = CH3 −CH2 −CH3

Q38.Which among the following has highest boiling point? (1) CH3CH2CH2CH3 (2) CH3CH2CH2CH2 - OH (3) CH3CH2CH2CHO (4) H5C2 - O - C2H5

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.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.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.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.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.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