Practice Questions

Q36.Excess of isobutane on reaction with Br2 in presence of light at 125°C gives which one of the following, as the major product? JEE Main 2021 (26 Aug Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q36.The INCORRECT statement regarding the structure of C60 is : (1) The six-membered rings are fused to both six and (2) Each carbon atom forms three sigma bonds. five-membered rings. (3) The five-membered rings are fused only to six- (4) It contains 12 six-membered rings and 24 five- membered rings. membered rings.

Q36.In stratosphere most of the ozone formation is assisted by : (1) γ -rays (2) cosmic rays (3) visible radiations (4) ultraviolet radiation

Q36.Which of the following compounds does not exhibit resonance ? (1) CH3 CH2 OCH = CH2 (2) (3) CH3 CH2 CH2 CONH2 (4) CH3 CH2 CH = CHCH2 NH2

Q36.Which one of the following metals forms interstitial hydride easily ? (1) Cr (2) Fe (3) Mn (4) Co JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper

Q36.Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H2SO4 followed by treatment with NaOH? JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q36.An organic compound 'A' C4H8on treatment with KMnO4 / H+ yields compound 'B' C3H6O. Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is : (1) 2-Methylpropene (2) 1-Methylcyclopropane (3) But-2-ene (4) Cyclobutane

Q36.Which one of the following compounds is non-aromatic? (1) (2) (3) (4)

Q36.The incorrect statement about B2H6 is : JEE Main 2021 (25 Feb Shift 1) JEE Main Previous Year Paper (1) All B −H −B angles are of 120° (2) The two B −H −B bonds (bridged and terminal) are not of same length. (3) Terminal B −H bonds have less p -character (4) Its fragment, BH3, behaves as a Lewis acid. when compared to bridging bonds.

Q36.Given below are two statements : Statement I : C2H5 OH and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option : (1) Statement I is true but statement II is false (2) Both statement I and statement II are true (3) Statement I is false but statement II is true (4) Both statement I and statement II are false

Q36. H+ / H2O In the following sequence of reactions, C3H6 ⟶ A KIO + C. The compounds B and C respectively are : dilKOHB JEE Main 2021 (01 Sep Shift 2) JEE Main Previous Year Paper (1) CI3COOK, CH3I (2) CH3I, HCOOK (3) CI3COOK, HCOOH (4) CHI3, CH3COOK

Q36.Which of the following forms of hydrogen emits low energy β− particles? (1) Deuterium 21H (2) Proton H+ (3) Tritium 31H (4) Protium 11H

Q36.The correct pair(s) of the ambident nucleophiles is (are): (A) AgCN / KCN (B) RCOOAg / RCOOK (C) AgNO2 / KNO2 (D) AgI / KI (1) (B) and (C) only (2) (A) only (3) (A) and (C) only (4) (B) only

Q36.The gas ′A′ is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV -radiations in stratosphere. The intermediates formed initially from the gas ′A′ are: (1) (2) (3) (4)

Q36. Correct statement about the given chemical reaction is (1) Reaction is possible and compound (A) will be (2) −¨NH2 group is ortho and para directive, so major product. product (B) is not possible. (3) Reaction is possible and compound (B) will be (4) The reaction will form sulphonated product the major product. instead of nitration.

Q36.Given below are two statements : Statement I : Hyperconjugation is a permanent effect. + Statement II : Hyperconjugation in ethyl cation − involves the overlapping of Csp2 −H1 s bond (CH3 CH2) with empty 2p orbital of other carbon. Choose the correct option: (1) Both statement I and statement II are false (2) Statement I is incorrect but statement II is true (3) Statement I is correct but statement II is false (4) Both Statement I and statement II are true.

Q36.Find A, B and C in the following reactions: NH3 + A + CO2 →(NH4)2 CO3 (NH4)2 CO3 + H2O + B →NH4 HCO3 NH4 HCO3 + NaCl →NH4 Cl + C (1) A −H2O; B −CO2; C −NaHCO3 (2) A −H2O; B −O2; C −Na2 CO3 (3) A −H2O; B −O2; C −NaHCO3 (4) A −O2; B −CO2; C −Na2 CO3

Q36.Assertion A : Enol form of acetone [CH3 COCH3] exists in < 0. 1% quantity. However, the enol form of acetyl acetone [CH3 COCH2 OCCH3] exists in approximately 15% quantity. Reason R : enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone. Choose the correct statement: (1) A is false but R is true (2) Both A and R are true and R is the correct explanation of A (3) Both A and R are true but R is not the correct (4) A is true but R is false explanation of A

Q36. Among the given species the Resonance stabilised carbocations are: (1) (C) and (D) only (2) (A), (B) and (D) only (3) (A) and (B) only (4) (A), (B) and (C) only

Q36.Compound with molecular formula C3H6O can show: (1) Positional isomerism (2) Both positional isomerism and metamerism (3) Metamerism (4) Functional group isomerism

Q36. Consider the given reaction, the Product A is: (1) (2) (3) (4)

Q36.Which of the following is an aromatic compound? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37. The correct order of stability of given carbocation is: (1) A > C > B > D (2) D > B > C > A (3) D > B > A > C (4) C > A > D > B

Q37. BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as: (1) A < 5, B > 17 (2) A > 50, B < 27 (3) A > 15, B > 47 (4) A > 25, B < 17

Q37.Which of the following molecules does not show stereo isomerism ? JEE Main 2021 (22 Jul Shift 1) JEE Main Previous Year Paper (1) 3, 4 -Dimethylhex- 3 -ene (2) 3 -Methylhex- 1 -ene (3) 3 -Ethylhex- 3 -ene (4) 4 -Methylhex- 1 -ene