Practice Questions

Q41.A compound of formula A2B3 has the HCP lattice. Which atom forms the HCP lattice and what fraction of the tetrahedral voids are occupied by the other atoms? (1) HCP lattice - B (2) HCP lattice - A 3 2 tetrahedral voids - A 31 tetrahedral voids - B (3) HCP lattice - B (4) HCP lattice - A 3 1 tetrahedral voids - A 23 tetrahedral voids - B JEE Main 2019 (10 Jan Shift 2) JEE Main Previous Year Paper

Q41.Among the following four aromatic compounds, which one will have the lowest melting point? (1) (2) (3) (4)

Q41.At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x Å . What is the approximate density of Cu (in g cm−3 ) at this temperature? [Atomic Mass of Cu = 63.55 u] (1) 105 (2) 205 x3 x3 (3) 422 (4) 211 x3 x3

Q41.Arrange the following amines in the decreasing order of basicity. (1) III > I > II (2) I > III > II (3) III > II > I (4) I > II > III

Q41.Which of the following compounds will produce a precipitate with AgNO3? (1) (2) (3) (4)

Q41.Which one of the following is likely to give a precipitate with AgNO3 solution? (1) CH2 = CH −Cl (2) (CH3)3CCl (3) CCl4 (4) CHCl3

Q41.Polysubstitution is a major drawback in: (1) Reimer Tiemann reaction (2) Friedel Craft's alkylation (3) Acetylation of aniline (4) Friedel Craft's acylation

Q42.A solution containing 62 g ethylene glycol in 250 g water is cooled to −10oC . If Kf for water is 1.86 K kg mol−1 , the amount of water (in g ) separated as ice is: (1) 48 (2) 64 (3) 16 (4) 32

Q42.The major product of the following reaction is: JEE Main 2019 (12 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.An organic compound is estimated through Dumas method and was found to evolve 6 moles of CO2, 4 moles of H2O and 1 mole of nitrogen gas. The formula of the compound is: (1) C12H8 N (2) C12H8 N2 (3) C6H8 N2 (4) C6H8 N

Q42.The major product of the following reaction is (1) CH3CD(I)CHD(Cl) (2) CH3CD(Cl)CHD(I) (3) CH3CD2CH(Cl)(I) (4) CH3C(I)(Cl)CHD2

Q42.In chromatography, which of the following statements is incorrect for Rf? (1) Higher Rf value means higher adsorption. (2) The value of Rf cannot be more than one. (3) Rf value depends on the type of chromatography. (4) Rf value of dependent on the mobile phase.

Q42.The correct order for acid strength of compounds CH ≡CH, CH3 −C ≡CH and CH2 = CH2 is as follows: (1) CH3 −C ≡CH > CH ≡CH > CH2 = CH2 (2) HC ≡CH > CH3 −C ≡CH > CH2 = CH2 (3) CH ≡CH > CH2 = CH2 > CH3 −C ≡CH (4) CH2 −C ≡CH > CH2 = CH2 > HC ≡CH JEE Main 2019 (12 Jan Shift 1) JEE Main Previous Year Paper

Q42.The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is: JEE Main 2019 (10 Apr Shift 1) JEE Main Previous Year Paper (1) II < I < III (2) III < II < I (3) III < I < II (4) I < III < II

Q42.The increasing order of the pKb of the following compund is: ( A ) ( B ) ( C ) ( D ) (1) ( B ) < ( D ) < ( C ) < ( A ) (2) ( B ) < ( D ) < ( A ) < ( C ) (3) ( C ) < ( A ) < ( D ) < ( B ) (4) ( A ) < ( C ) < ( D ) < ( B )

Q42.Which amongst the following is the strongest acid? (1) CHCN3 (2) CHI3 (3) CHBr3 (4) CHCl3

Q42.In the following skew conformation of ethane, H' −C −C −H′′ dihedral angle is: (1) 58o (2) 120o (3) 149o (4) 151o

Q43.Which of these factors does not govern the stability of a conformation in acyclic compounds? (1) Steric interactions (2) Angle strain (3) Torsional strain (4) Electrostatic forces of interaction

Q43.If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction. Zn(s) + Cu2+(aq) ⇌Zn2+(aq) + Cu(s) at 300 K is approximately: (R = 8 JK −1mol−1, F = 96000 C mol−1) (1) e−160 (2) e−80 (3) e160 (4) e320

Q43.The major product (s) obtained in the following reaction is/are: (1) (2) (3) (4)

Q43.The compounds A and B in the following reaction are, respectively: (1) 𝐴= Benzyl alcohol, 𝐵= Benzyl isocyanide (2) 𝐴= Benzyl chloride, 𝐵= Benzyl isocyanide (3) 𝐴= Benzyl alcohol, 𝐵= Benzyl cyanide (4) 𝐴= Benzyl chloride, 𝐵= Benzyl cyanide

Q43.The higher concentration of which gas in air can cause stiffnes of flower buds? (1) NO (2) CO2 (3) SO. (4) CO

Q44.Which is wrong with respect to our responsibility as a human being to protect our environment? (1) Using plastic bags. (2) Restricting the use of (3) Avoiding the use of (4) Setting up compost tin vehicles floodlighted facilities in gardens

Q44.In the cell, Pt(s)|H2(g, 1 bar)| HCl (aq)|AgCl(s)| Ag(s)|Pt(s),the cell potential is 0 .92 V when a 10−6 molar HCl solution is used. The standard electrode potential of Ag AgCl Cl− electrode is: (Given, 2.303RT F = 0 .06 V at 298 K) (1) 0 .76 V (2) 0 .20 V (3) 0 .40 V (4) 0 .94 V

Q44.At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg , lowering of vapour pressure will be: (molar mass of urea = 60 g mol−1 ) (1) 0.028 mm Hg (2) 0.027 mm Hg (3) 0.031 mm Hg (4) 0.017 mm Hg