Kindly give answers of these MCQ's type questions urgently needed, don't reject this.

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Kindly give answers of these MCQ's type questions urgentlyneeded, don't reject this.

Kindly Give Answers Of These Mcq S Type Questions Urgently Needed Don T Reject This 1 (296.88 KiB) Viewed 70 times

Br 16 Bi increasing rate of reactivity with chlorine and aluminum chloride. 38. Which sequence correctly ranks the following aromatic rings in order of D) benzyne A) quinine B) radical cation 37.What intermediate aromatic substitution mechanism? E) positively charged sigma comple ON Br is thought to occur in the elimination-addition nucleophilie 1 3 A) 3<2<1 B) 2<3<1 C)2<1 <3 D) 1<3<2 E)1<2<3 substitution mechanism. 1) 3.5-dinitrophenol is formed via an elimination-addition nucleophilic aromatic А. BOH mechanism. substitution A D) 2.4-dinitrophenol is formed via an elimination-additon nucleophilic aromatic () 2,4-dinitrophenol is formed via an electrophilic aromatic substitution mechanism. B) 3.5-dimitrophenol is formed via an electrophilic aromatic substitution mechanism. A 39. Which of the following is an intermediate when 1,2-dibromo-4-nitrobenzene is heated with NaOH in a nucleophilic aromatic substitution reaction? 60.00 HO NO₂ NO₂ 1 By the nature of the leaving group C) the concentration of the alkyl halide D) the concentration of the nucleophile E) the value of the rate constant mechanism substitution A) 2.4-dinitrophenol is formed via an addition-elimination nucleophilic aromatic () CN B. HO B 6 B) 40. Which statement about the diazonium cation PhN, is incorrect? A) Elimination of N₂ accompanies the reaction of PhN;" with Cul in the presence of excess I B 44. Which of the following is the poorest leaving group? D) OH Ε) ΝΗΣ A) HB) CH₂0 C) H₂O followed by protonation: 36. When 2,4-dinitrochlorobenzene is treated with sodium hydroxide at 100°C C) acetophenone mong compounds will undergo Friedel-Crafts alkylation with C B) PhN, is hydrolysed in water to phenol. C) Coupling of PhN₂ with a phenol occurs with loss of N₂. D) PhN₂ reacts with CuCN in the presence of excess CN to give cyanobenzene. Albenzenesulfonic acid (CH), CCI, AICI, most rapidly? Br DIBAL H₂O B) toluene 41. When the carbonyl group of a neutral ketone is protonated: A) the resulting species is activated toward nucleophilic attack. B) the resulting species has a positive charge. C) the resulting species becomes more electrophilic. D) subsequent nucleophilic attack on the resulting species is said to occur under acid- catalyzed conditions. E) all of the above. 46. The conjugate acid of which of the following is least stable C) Aniline A) Methylamine B) Guanidine C Dievanobenzene 42. Which of the following is least likely to undergo a smooth crossed Claisen condensation with methyl pentanoate? C) PhCO₂CH; A) (CH₂):CCO₂CH; B) HCO₂CH₂ E) (CH;O),CO D) PhCH,CÓ CH C) both El and E2 49. A strong base is needed for B) E2 only A) El only 50. Which of the following be easily protonated A) Methylamine B) Guanidine C) Aniline 51. Which of the following free radicals is least stable? 43. Which one of the following statements is incorrect? A) In syn-addition of HBr to an alkene. H and Br add to the same side of the C-C bond. B) In anti-addition of HBr to an alkene. H and Br add to opposite sides of the C C bond. C) In the electrophilic addition of HBr to an alkene. there is always an equal chance of syn- and anti-additions. 47. The conjugate base of which of the following is stronger base A) Nitroethane 35. Which of the following D) The stereochemistries of the products of the syn- and unti-additions of HBr to but-2- ene are different. D 52. Pick out the carbocation which is least stable. A. Aldehyde B. carboxylic acid 45. Which of the following factors has no effect on the rate of SNI reactions? A) the nature of the alkyl halide D) meta and para onl A) ortho only By meta only Chortho. meta, and para D with NaNI12? 34. Which toluidine isomers are possible products when m-bromotoluene is treated B) Nitromethane C) Dinitromethane D) Trinitromethane 48.How many alkenes are formed by E2 elimination of HBr from 3-bromo-3,4- dimethylhexane using a strong base such as sodium methoxide? A) 2 By 3 C) 4 D) 5 Di caction with NaOH? 11.5 dinitmchlorabenzene trochlorabenzene C. Alcohol (12.4-dinitrochlorobenzene 33. Which of the following compounds is least reactive in the nucleophilic aromatic D) Pyrrole D. None of them D) only p-tofuidine. El a mixture of B) only Ara mixture of o- and mi-toluidine. B) only m-toluidine. Conly o-toluidime 32. When o-fluorotoluene is treated with sodium antide, the product is: -toloidine. 53. How many lone pairs of electrons are present in the Pyridine molecule. C. 8 D. 0 A. 2 B.6 54. What is the formal charge on the carbon atom of Carbene? A. 1 B.2 C.3 D.None of them 55. Which is the best reagent for converting an ester into an aldehyde? C. H2/Pd-C D. DIBAL A. NaBH, B. LIAIH, D) neither El nor E2 56. Synsytematic name of pyridine is A. Azole B. Azine 57.Predict the reagent for the conversion of Benzoic acid into Benzyly alcohol. C. Azetidine D. None of them B. LIAIH C. H2/Pd- A. NaBH, D. BH₂ 58. Whitmore 1,2-Shift are known as.. A. Electrophilic Rearrangement C. Free Radical rearrangement 59.-CN group is converted into D) Pyrrole B. Nucleophilic Rearrangement D. None of Them the following reaction
60. The following reaction is known as........ H₂, Pd/BaSO, R CH R₂N A. Rosenmund Reaction C. Aldol Reaction 61. Structure of Pyrrolidine A 11. C A 62. The Structure of DABCO is represented as..... N B Q B 63. Which is the weakestt base among the following N B. Wolf-Kishner Reaction D. None of them is the following NH NH D. None of them B. 64. The Structure of Dithiane is represented as A C D CH₂N₂ H..S R H C 65. PCC is an ..agent. A. Oxidizing agent B. Reducing agent C. An Intermediate 66. In a Typical Favoriski Rearrangement the product is a...... A. Aldehyde B. Ketone C. An Ester D. None of Them 67. This reaction is an example of...... 1 OH ? C 2. H* A. Benzilic Acid Rearrangement C. Stevens Rearrangement 68. Migration of an Alkyl group to cation center is known as........ A. Benzilic Acid Rearrangement D None of them H H HOC OH C. Stevens Rearrangement 69. The product of the following reaction is ...... ly H CA cyclic lactone B. Cycloheptanone A Cyclopentanone C. Methyl Group 70. In the Baeyer-Villiger Reaction the best migrating group is A. Ter-Alkyl group B. Phenyl group 71. Which reducing agent can be utilized in protic solvents B. NaBH, C. Both A and B D. None of Them A. LiAlH, 72. Oxazole structure is as follows. BO C. CH D cout OH H Br HOH Ph OH NH NH D. None of them 73. Imidazole is an organic compound which has... A. Two N B. One N and one O C Two nitrogen and one Oxygen D. None of them. 74. n-Butyl Benzene when treated with KMnO, will yield.... A. 3-Phenyl Propanoic acid B. Benzoic Acid D. Styrene D. All of Them OCH Ph 75. Jones oxidation involves the following reagents... A. H₂O₂ B. O, C. CH3CO,H D. Sodium dichromate/dil H₂SO, 76) Which of the following molecules contains perpendicular dissymmetric plane? cont У соон B. Baeyer-Villiger D. None of them HO H B. Wagner-Meerwinn Rearrangement D. None of them A D 77) Which of the following is true of any (R)-enantiomer? All rotates plane-polarized light to the right. B) It rotates plane-polarized light to the left. C) It is a racemic form. D) It is the mirror image of the corresponding (S)-enantiomer. E) It has the highest priority group on the left. 78) How many asymmetric carbons are present in the following compound? etts "HO BY A12 B) 3 C)4 D)S 79) Which of the following molecules is symmetric? A) (2R 3R)-2,3-Dichloropentane A) enantiomers D) both A and C E) both B and C ران و B) (2R,3S)-2.3-Dichloropentane C)(254S)-2,4-Dichloropentane D) (25.4R)-2,4-Dichloropentane L 80) What term describes the structural relationship between (2R.3R.4S)-2.3.4- trichloroheptane and (2S,3S.5R)-2.3.5-trichloroheptane? At not isomers B) constitutional isomers C) enantiomers E) conformers Di diastereomers 81) Which of the following incorrectly describes cis-1.2-dimethylcyclopentane? A) is a meso compound B) It is actural carbons enantiomer. D) Its diastereomer is trans-1.2-dimethylcyclopentane 951 Fries rearrangement an example of A) Intermolecular rearrangement C1 Free radical rearrangement D. None of Them D. B and C.. D. All are same 82) Which of the following configurations corresponds to the structure below? CHCH₂ A) This compound is chiral. B) The enantiomer of this compound is (3S. 4S)-3,4-dimethylhexane. C) This compound is a diastereomer of (3R, 4S)-3,4-dimethylhexane D) all of the above E) none of the above 99) Assign the correct product A) (4R. SR) B) 14R. SS) C) (4S. 5R) D) (4S, 5S) 83) Which of the statements below correctly describes an achiral molecule? A) The molecule has a nonsuperimposable mirror image. B) The molecule exhibits optical activity when it interacts with plane-polarized light. C) The molecule has an enantiomer. D) The molecule might be a meso form. E) None of the above 84) Which of the following statements is (are) true for the compound 3R, 4R)-3.4- dimethylhexane? 100) Assign the correct product Aru # C) It contains two asymmetric 85) Which of the following terms correctly describe(s) the structural relationship between cis-1.3-dimethylcyclopentane and trans-1.3-dimethylcyclopentane? B) diastereomers C) geometric isomers 86) Zerewitinoff reagent, is used to determine hydrogen attached on A) Hetero atom B) Carbon C) Both D) none of them 87) Zeisel method is used to know about number of A) Methyl Groups B) Number of Hydrogens B) C) Number of methoxy groups D) none of them 88) Methylenedioxyl group (-OCH₂0-) is indicated by formation of A) formaldehyde B) acetaldehyde C) Both D) none of them 96) Isocyanate is formed as intermediate in A Hottmann rearrangement C) Wittig rearrangement 89) What information is achieved from Herzig-Meyer reaction? A) N-Methyl Groups B) O-Methyl Groups C) C-Methyl Groups D) none of them 90) What information could be achieved from Hofmann's exhaustive methylation method? A1 Holmann's exhaumve methylation metfjod B) Von-Histo 92) Citral and Camphor are none of them A) Terpenoid E) It has an 93) Citral and Camphor are A) Hemiterpenoid B) onoterpenoid C) Sesquiterpenoid 1 none of them 94) Basic sekeleton of steroids is A) Biphenyl B) Naphthatene C) Phenanthiene Dj None of the B) Intramolecular rearrangement D) None of the above B) Curtius rearrangement D) Pinacole rearrangement 98) The reaction in which ketone is converted into ester is called Al Beckmann rearrangement B, Bayer-Villiger rearrangement Curtius rearrangement D) Favorskii rearrangement 97) When the dip in energy profile becomes indistinguishable from a TS. it is called A) Stable intermediate P) Metastable intermediate C) Pseudo T.S. Dj None of the above