Practice Questions

Q37.Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p- nitrophenol and picric acid? (1) Steam distillation (2) 2 −5 ft long column of silica gel (3) Sublimation (4) Preparative TLC (Thin Layer Chromatography) JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper

Q37.The correct order of nucleophilicity is (1) F−> OH− (2) H2 ¨O > OH− (3) ROH > RO− (4) NH−2 > NH3

Q37.Arrange the following carbocations in decreasing order of stability. (1) A > C > B (2) B > A > C (3) C > B > A (4) C > A > B

Q37.Given below are two statements: Statement I : The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases. Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions. In the light of the above statements. Choose the correct answer from the options given below. JEE Main 2022 (27 Jul Shift 1) JEE Main Previous Year Paper (1) Both statement I and Statement II are true (2) Both statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true

Q37.Which will have the highest enol content? JEE Main 2022 (26 Jun Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.Match List-I with List-II. List-I List-II A I Spiro compound B II Aromatic compound C III Non-planar Heterocyclic compound D IV Bicyclo compound Choose the correct answer from the options given below (1) A - II, B - I, C - IV, D - III (2) A - IV, B - III, C - I, D - II (3) A - III, B - IV, C - I, D - II (4) A - IV, B - III, C - II, D - I JEE Main 2022 (28 Jul Shift 1) JEE Main Previous Year Paper

Q37.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Boric acid is a weak acid Reason R : Boric acid is not able to release H+ ion on its own. It receives OH- ion from water and releases H+ ion. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Both A and R are correct and R is the correct (2) Both A and R are correct but R is NOT the explanation of A correct explanation of A (3) A is correct but R is not correct (4) A is not correct but R is correct

Q38.In 3 d series, the metal having the highest M2+/M standard electrode potential is (1) Cr (2) Fe (3) Cu (4) Zn

Q38.The product formed in the following reaction. is: JEE Main 2022 (25 Jun Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.Given are two statements one is labelled as Assertion and other is labelled as Reason. Assertion: Magnesium can reduce Al2 O3 at a temperature below 1350 °C, while above 1350 °C aluminium can reduce MgO. Reason: The melting and boiling points of magnesium are lower than those of aluminium. In light of the above statements, choose most appropriate answer from the options given below (1) Both Assertion and Reason are correct, and (2) Both Assertion and Reason are correct, but Reason is correct explanation of Assertion. Reason is NOT the correct explanation of Assertion. (3) Assertion is correct Reason is not correct. (4) Assertion is not correct, Reason is correct.

Q38.Given below are two statements. Statement I: The presence of weaker π -bonds make alkenes less stable than alkanes Statement II: The strength of the double bond is greater than that of carbon-carbon single bond. In the light of the above statements, choose the correct answer from the options : given below. (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q38.Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: Polluted water may have a value of BOD of the order of 17ppm. Reason: BOD is a measure of oxygen required to oxidise both the biodegradable and non-biodegradable organic material in water. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Both Assertion and Reason are true and Reason is (2) Both Assertion and Reason are true but Reason is the correct explanation of Assertion. NOT the correct explanation of Assertion. (3) Assertion is true but Reason is false. (4) Assertion is false but Reason is true.

Q38.Which of the following compounds is not aromatic? (1) (2) (3) (4)

Q38.Major product of the following reaction is JEE Main 2022 (25 Jul Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.The geometry around boron in the product 'B' formed from the following reaction is 450 K BF3 + NaH ⟶ A + NaF A + NMe3 →B (1) trigonal planar (2) tetrahedral (3) pyramidal (4) square planar

Q38.Match List-I with Match List-II List-I List-II (Metal) (Application) (A) Cs (I) High temperature thermometer (B) Ga (II) Water repellent sprays (C) B (III) Photoelectric cells (D) Si (V) Bullet proof vest Choose the most appropriate answer from the options given below (1) (A) −(III), (B) −(I), (C) −(IV), (D) −(II) (2) (A) −(II), (B) −(III), (C) −(IV), (D) −(I) (3) (A) −(IV), (B) −(III), (C) −(II), (D) −(I) (4) (A) −(I), (B) −(IV), (C) −(II), (D) −(II)

Q38.The correct IUPAC name of the following compound is (1) 4 -methyl- 2 -nitro- 5 -oxohept- 3 -enal (2) 4 -methyl- 5 -oxo- 2 -nitrohept- 3 -enal (3) 4 -methyl- 6 -nitro- 3 -oxohept- 4 -enal (4) 6 -formyl- 4 -methyl- 2 -nitrohex- 3 -enal

Q39.Given below are two statements : one is labelled as Assertion and the other is labelled as Reason. Assertion: At 10 °C, the density of a 5 M solution of KCl [atomic masses of K & Cl are 39 & 35. 5 g mol−1 respectively], is ' x' gml−1 . The solution is cooled to −21 °C. The molality of the solution will remain unchanged. Reason: The molality of a solution does not change with temperature as mass remains unaffected with temperature. In the light of the above statements, choose the correct answer from the options given below. (1) Assertion is true but Reason is false. (2) Assertion is false but Reason is true. (3) Both Assertion and Reason are true and Reason is (4) Both Assertion and Reason are true but Reason is the correct explanation of Assertion. not the correct explanation of Assertion.

Q39.Statement I: Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III). JEE Main 2022 (27 Jun Shift 2) JEE Main Previous Year Paper Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement 1 and statement 2 are correct (2) Both Statement 1 and statement 2 are incorrect (3) Statement 1 is correct but statement 2 is incorrect (4) Statement 1 is incorrect but statement 2 is correct

Q39.Given below are two statements : Statement I : According to the Ellingham diagram, any metal oxide with higher ΔG° is more stable than the one with lower ΔG° . Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram. 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) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q39.Which of the following carbocations is most stable: (1) (2) (3) (4)

Q39.Nitrogen gas is obtained by thermal decomposition of: (1) NaNO2 (2) NaNO3 (3) Ba (N3)2 (4) Ba (NO3)2

Q39.Given below are two statements: Statement I: For KI, molar conductivity increases steeply with dilution. Statement II: For carbonic acid, molar conductivity increases slowly with dilution. In the light of the above statements, choose the correct answer from the options given below (1) Statement I is correct and Statement II is (2) Both Statement I and Statement II are false incorrect (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true

Q39.Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose the correct answer from the options given below (1) C < D < E < A < B (2) D < B < E < A < C (3) D < C < E < A < B (4) C < D < E < B < A

Q39.Given below are two statements: Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing. Statement II : For stabilisation of an emulsion, excess of electrolyte is added. 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) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.