Practice Questions

Q40.Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) and (z) is (1) 3 (2) 2 (3) 4 (4) 1

Q40.Consider the following reaction: The product ′P′gives positive ceric ammonium nitrate test. This is because of the presence of which of these – OH group(s)? (1) (b) only (2) (c) and (d) (3) (d) only (4) (b) and (d)

Q40.The isomer(s) of [Co(NH3)4Cl2] that has/ have a Cl −Co −Cl angle of 90o, is/are: (1) meridional and trans (2) cis and trans (3) trans only (4) cis only JEE Main 2020 (09 Jan Shift 2) JEE Main Previous Year Paper

Q40.Which of the following is used for the preparation of colloids ? (1) Ostwald process (2) Van Arkel Method (3) Bredig's Arc Method (4) Mond Process

Q41.In the following reaction A is (1) (2) (3) (4)

Q41.The major product obtained from E2 -elimination of 3 −bromo −2 −fluoropentane is (1) (2) (3) (4)

Q41.The electronic spectrum of [Ti (H2O)6]3+ shows a single broad peak with a maximum at 20, 300 cm−1. The crystal field stabilization energy (CFSE) of the complex ion, in kJmol−1, is : (1 kJmol−1 = 83. 7 cm−1) (1) 145.5 (2) 242.5 (3) 83.7 (4) 97

Q41.Reaction of ammonia with excess Cl2 gives : (1) NH4 Cl and N2 (2) NH4 Cl and HCl (3) NCl3 and NH4 Cl (4) NCl3 and HCl cis −[Co(en)2 Cl2]+(B). The correct

Q41.The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is: (1) D > B > C > A (2) B > D > A > C (3) B > D > C > A (4) B > A > D > C JEE Main 2020 (08 Jan Shift 1) JEE Main Previous Year Paper

Q41.Consider that d6 metal ion (M2+) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4 .90 BM. The geometry and the crystal field stabilization energy of the complex is : (1) octahedral and −2. 4Δ0 + 2P (2) tetrahedral and −0 .6 Δt (3) octahedral and −1. 6Δ0 (4) tetrahedral and −1. 6Δt + 1P

Q41.The major product [B] in the following reaction is : (1) CH2 = CH2 (2) (3) (4) CH3 −CH2 CH = CH −CH3

Q41.For the following reactions where, ks and ke , are respectively, the rate constants for substitution and elimination, and μ = ks , the correct option ke is ________ (1) μB > μA and ke(A) > ke(B) (2) μA > μB and ke(B) > ke(A) (3) μB > μA and ke(B) > ke(A) (4) μA > μB and ke(A) > ke(B)

Q41.The theory that can completely/properly explain the nature of bonding in [Ni (CO)4] is: (1) Werner's theory (2) Molecular orbital theory (3) Crystal field theory (4) Valence bond theory Q42. 1-methyl ethylene oxide when treated with an excess of HBr produces (1) (2) (3) (4) JEE Main 2020 (07 Jan Shift 1) JEE Main Previous Year Paper

Q41.The set that contains atomic numbers of only transition elements, is : (1) 37,42,50,64 (2) 21,25,42,72 (3) 9,17,34,38 (4) 21,32,53,64

Q41.The increasing order of the boiling points of the major products A, B and C of the following reactions will be : (a) (b) (c) (1) B < C < A (2) C < A < B (3) A < B < C (4) A < C < B JEE Main 2020 (06 Sep Shift 2) JEE Main Previous Year Paper

Q41.An organic compound (A) (molecular formula C6H12O2 ) was hydrolysed with dil. H2 SO4 to give a carboxylic acid (B) and an alcohol (C). ‘ C ’ gives white turbidity immediately when treated with anhydrous ZnCl2 and conc. HCl. The organic compound (A) is: JEE Main 2020 (04 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.Which of the following derivatives of alcohols is unstable in an aqueous base? (1) (2) (3) (4) RO −CMe3

Q41.A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are: (1) Na and NaNO3 (2) Na and Mg3N2 (3) Mg and Mg3N2 (4) Mg and Mg(NO3)2 JEE Main 2020 (08 Jan Shift 2) JEE Main Previous Year Paper

Q41.The increasing order of the reactivity of the following compounds in nucleophile addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone (1) Benzaldehyde > Butanone < Propanone < Propanal (2) Butanone < Propanone < Benzaldehyde < Propanal (3) Propanal < Propanone < Butanone < Benzaldehyde (4) Benzaldehyde < Propanal < Propanone < Butanone

Q42.Consider the following reactions, The compound [P] is: (1) (2) (3) (4) JEE Main 2020 (09 Jan Shift 2) JEE Main Previous Year Paper

Q42.The most appropriate reagent for conversion of C2H5 CN into CH3 CH2 CH2 NH2 is : (1) NaBH4 (2) CaH2 (3) LiAlH4 (4) Na(CN) BH3

Q42.The major product [B] in the following sequence of reactions is: (1) (2) (3) (4)

Q42.Consider the complex ions, trans- [Co(en)2 Cl2]*(A) and statement regarding them is : (1) both (A) and (B) cannot be optically active. (2) (A) can be optically active, but (B) cannot be optically active. (3) both (A) and (B) can be optically active. (4) (A) cannot be optically active, but (B) can be optically active.

Q42.For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements : (I) both the complexes can be high spin. (II) Ni(II) complex can very rarely be of low spin. (III) with strong field ligands, Mn(II) complexes can be low spin. (IV) aqueous solution of Mn(II) ions is yellow in color. The correct statements are : (1) (I) and (II) only (2) (I), (II) and (IV) only (3) (I), (II) and (III) only (4) (II), (III) and (IV) only

Q42.Consider the following reactions: Which of these reactions are possible? JEE Main 2020 (07 Jan Shift 2) JEE Main Previous Year Paper (1) (a) and (b) (2) (a) and (d) (3) (b), (c) and (d) (4) (b) and (d)