Practice Questions

Q54.In SN2 reactions, the correct order of reactivity for the following compounds : CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is : (1) CH3Cl > (CH3)2CHCl > CH3CH2Cl > (2) CH3Cl > CH3CH2Cl > (CH3)2CHCl > (CH3)3CCl (CH3)3CCl (3) CH3CH2Cl > CH3Cl > (CH3)2CHCl > (4) (CH3)2CHCl > CH3CH2Cl > CH3Cl > (CH3)3CCl (CH3)3CCl

Q55.Williamson synthesis of ether is an example of : (1) Nucleophilic substitution (2) Electrophilic addition (3) Nucleophilic addition (4) Electrophilic substitution

Q55.Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions? (1) Claisen (2) Friedel-craft (3) Sandmeyer (4) Wurtz

Q56.Which is the major product formed when acetone is heated with iodine and potassium hydroxide? (1) Acetophenone (2) Iodoform (3) Iodoacetone (4) Acetic acid

Q57.In the Victor-Meyer's test, the colour given by 1∘, 2∘ and 3∘ alcohols are respectively: (1) Red, colourless, blue (2) Red, blue, colourless (3) Colourless, red, blue (4) Red, blue, violet

Q58.On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is : (1) An alkanol (2) An alkanediol (3) An alkyl cyanide (4) An alkyl isocyanide

Q58.Which one of the following is an example of thermosetting polymer? (1) Nylon -6,6 (2) Bakelite (3) Buna - N (4) Teflon

Q59.Aminoglycosides are usually used as: (1) antibiotic (2) analgesic (3) hypnotic (4) antifertility

Q59.Structure of some important polymers are given. Which one represents Buna-S ? (1) (2) (3) (4) JEE Main 2014 (09 Apr Online) JEE Main Previous Year Paper

Q59.Among the following organic acids, the acid present in rancid butter is : (1) Pyruvic acid (2) Acetic acid (3) Butyric acid (4) Lactic acid

Q60.Which one of the following class of compounds is obtained by polymerization of acetylene ? (1) Poly-ene (2) Poly-amide (3) Poly-yne (4) Poly-ester

Q60.Which one of the following is used as Antihistamine? (1) Omeprazole (2) Chloranphenicol (3) Diphenhydramine (4) Norethindrone

Q60.The reason for double helical structure of DNA is the operation of : (1) Van der Waals forces (2) Electrostatic attractions (3) Hydrogen bonding (4) Dipole - Dipole interactions

Q60.Which one of the following bases is not present in DNA ? (1) Quinoline (2) Adenine (3) Cytosine (4) Thymine

Q31.The molarity of a solution obtained by mixing 750 mL of 0. 5(M) HCl with 250 mL of 2(M) HCl will be (1) 1. 75 M (2) 0. 975 M (3) 0. 875 M (4) 1. 00 M

Q31.In an atom how many orbital(s) will have the quantum numbers; n = 3, l = 2 and ml = +2 ? (1) 5 (2) 3 (3) 1 (4) 7

Q31.Number of atoms in the following samples of substances is largest in: (1) 4.0 g of hydrogen (2) 71.0 g of chlorine (3) 127.0 g of iodine (4) 48.0 g of magnesium

Q32.The wave number of the first emission line in the Balmer series of H -Spectrum is : (R = Rydberg constant ) : (1) 5 R (2) 9 R 36 400 (3) 7 R (4) 3 R 6 4

Q32.The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is : JEE Main 2013 (23 Apr Online) JEE Main Previous Year Paper (1) 6.626 × 10−34 m (2) 6.626 × 10−38 m (3) 6.626 × 10−31 m (4) 6.626 × 10−30 m

Q33.The order of increasing sizes of atomic radii among the elements O, S, Se and As is : (1) As < S < O < Se (2) Se < S < As < O (3) O < S < As < Se (4) O < S < Se < As

Q36.The correct order of viscosity of the following liquids will be : (1) Water < methyl alcohol < dimethyl ether < glycerol (2) methyl alcohol < glycerol < water < dimethyl ether (3) dimethyl ether < methyl alcohol < water < glycerol (4) glycerol < dimethyl ether < water < methyl alcohol

Q36.Which one of the following cannot function as an oxidising agent? (1) I− (2) S(s) (3) NO−3 (aq) (4) Cr2O2−7

Q36.The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be : (1) -10.2 eV (2) +2.55 eV (3) -2.55 eV (4) -5.1 eV JEE Main 2013 (07 Apr) JEE Main Previous Year Paper

Q37.The reaction X →Y is an exothermic reaction. Activation energy of the reaction for X into Y is 150 kJ mol−1 . Enthalpy of reaction is 135 kJ mol−1 . The activation energy for the reverse reaction, Y →X will be : (1) 280 kJ mol−1 (2) 285 kJ mol−1 (3) 270 kJ mol−1 (4) 15 kJ mol−1

Q39.Which one of the following molecules is expected to exhibit paramagnetic behaviour? (1) O2 (2) O2 -2 (3) C2 (4) N2