Practice Questions

Q44.Which polymer has 'chiral' monomer(s)? (1) Neoprene (2) Buna −N (3) Nylon 6,6 (4) PHBV

Q44.The correct match between item - I and item - II is : Item - I Item - II (a) Natural rubber (I) 1, 3-butadiene + styrene (b) Neoprene (II) 1, 3-butadiene (c) Buna-N (III) chloroprene (d) Buna-S (IV) Isoprene (1) (a)-(III), (b)-(IV), (c)-(I), (d)-(II) (2) (a)-(III), (b)-(IV), (c)-(II), (d)-(I) (3) (a)-(IV), (b)-(III), (c)-(II), (d)-(I) (4) (a)-(IV), (b)-(III), (c)-(I), (d)-(II)

Q44.The major product Z obtained in the following reaction scheme is: (1) (2) (3) (4)

Q44.Which of the following will react with CHCl3 + alc. KOH? (1) Adenine and proline (2) Thymine and proline (3) Adenine and lysine (4) Adenine and thymine

Q44.The major products A and B in the following reactions are JEE Main 2020 (08 Jan Shift 1) JEE Main Previous Year Paper (1) (2) and and (3) (4) and and

Q44.In the following reaction sequence, [C] is : (1) (2) (3) (4)

Q44.In the following reaction sequence, the major product B is (1) (2) (3) (4)

Q44.The increasing order of pKb values of the following compounds is : (1) II < IV < III < I (2) I < II < IV < III (3) II < I < III < IV (4) I < II < III < IV

Q44.Consider the following reaction: The product 'X' is used: (1) in protein estimation as an alternative to (2) in acid base titration as an indicator ninhydrin (3) as food grade colourant (4) in laboratory test for phenols

Q45.Which one of the following statement is not true? JEE Main 2020 (06 Sep Shift 2) JEE Main Previous Year Paper (1) Lactose contains α−glycosidic linkage between (2) Lactose is a reducing sugar and it gives Fehling's C1 of galactose and C4 of glucose test. (3) Lactose (C11H22O11) is a disaccharide and it (4) On acid hydrolysis, lactose gives one molecule contains 8 hydroxyl groups. of D(+)−glucose and one molecule of D(+)− galactose.

Q45.Consider the following reactions : dry HCI x eq. of −−(i) Glucose +ROH → Acetal → acetyl derivative (CH3 CO)2 Ni /H2 y eq. of −−(ii) Glucose → A → acetyl derivative (CH3 CO)2O z eq. of −(iii) Glucose → acetyl derivative ' x' , ' y' and ' z' in these reactions are respectively. (CH3 CO)2O (1) 5, 4 & 6 (2) 4, 6 & 5 (3) 4, 5 & 5 (4) 5, 6 & 5

Q45.Which of the following statement is not true for glucose? (1) Glucose exists in two crystalline forms α and β (2) Glucose gives Schiff’s test for aldehyde (3) Glucose reacts with hydroxylamine to form (4) The pentaacetate of glucose does not react with oxime hydroxylamine to give oxime

Q45.The following molecule acts as an : (1) Antiseptic (2) Anti–depressant (3) Anti–bacterial (4) Anti–histamine

Q45.The mechanism of action of "Terfenadine" (Seldane) is : (1) Activates the histamine receptor (2) Inhibits the secretion of histamine (3) Helps in the secretion of histamine (4) Inhibits the action of histamine receptor

Q45.What are the functional groups present in the structure of maltose? (1) One ketal and one hemiketal (2) Two acetals (3) One acetal and one hemiacetal (4) One acetal and one ketal JEE Main 2020 (04 Sep Shift 1) JEE Main Previous Year Paper

Q45.The antifertility drug "Novestrol" can react with : (1) ZnCl2 / HCl; FeCl3; Alcoholic HCN (2) Br2 / water, ZnCl2 / HCl; FeCl3 (3) Alcoholic HCN; NaOCl; ZnCl2 / HCl (4) Br2 / water, ZnCl2 / HCl; NaOCl

Q45. A, B and C are three biomolecules. The results of the tests performed on them are given below: Molisch's test Barfoed Test Biuret Test A Positive Negative Negative B Positive Positive Negative C Negative Negative Positive A, B and C are respectively: (1) A = Glucose, B = Fructose C = Albumin (2) A = Lactose, B = Glucose, C = Albumin (3) A = Lactose, B = Glucose, C = Alanine (4) A = Lactose, B = Fructose, C = Alanine Q46. 10.30mg of O2 is dissolved into a liter of sea water of density 1.03g/mL . The concentration of O2 in ppm is _____________.

Q45.Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins. Reason (R) : High density polymers are closely packed and are chemically inert. Choose the correct answer from the following: (1) (A) is correct but (R) is wrong. (2) Both (A) and (R) are correct but (R) is not the correct explanation of (A). (3) Both (A) and (R) are correct and (R) is the (4) (A) and (R) both are wrong. correct explanation of (A).

Q45.Which of the following statements is correct? (1) Gluconic acid can form cyclic (acetal/hemiacetal) (2) Gluconic acid is a dicarboxylic acid structure (3) Gluconic acid is a partial oxidation product of (4) Gluconic acid is obtained by oxidation of glucose glucose with HNO3 JEE Main 2020 (07 Jan Shift 2) JEE Main Previous Year Paper

Q45. The correct observation in the following reaction is: Gly cosidic bond Seliw anoff −−Sucrose → A + B → ? Cleavage (Hydrolysis) Reagent (1) Formation of blue colour (2) Gives no colour (3) Formation of red colour (4) Formation of violet colour

Q45.For the following Assertion and Reason, the correct option is: Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7 −9 elements. Reason: The reactants are most strongly adsorbed on group 7 −9 elements. (1) The assertion is true, but the reason is false (2) Both assertion and reason are false (3) Both assertion and reason are true and the reason (4) Both assertion and reason are true but the reason is the correct explanation for the assertion is not the correct explanation for the assertion

Q46.The mass of ammonia in grams produced when 2. 8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is _____

Q46.The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3g of [Co(NH3)6]Cl3 is __________. M[Co(NH3)6]Cl3 = 267.46g/mol MAgNO3 = 169.87g/mol Report the nearest integer as the answer.

Q46.The standard heat of formation (ΔfH 298)0 of ethane (in kJ/mol ), if the heat of combustion of ethane, hydrogen and graphite are −1560, −393.5 and −286 kJ/mol , respectively is ________ Q47. 3 g of acetic acid is added to 250 mL of 0.1 M HCl and the solution made up to 500 mL. To 20 mL of this solution 1 mL of 5M NaOH is added. The pH of the solution is ________ 2 [Given: pKa of acetic acid = 4.75, molar mass of acetic acid 60 g/mol, log 3 = 0.4771 , Neglect any changes in volume]

Q46.For a dimerization reaction, JEE Main 2020 (05 Sep Shift 2) JEE Main Previous Year Paper 2A(g) →A2(g) at 298K, ΔU−= −20 kJmol−1, ΔS−= −30 JK−1 mol−1,then the ΔG− will be …..J.