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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Identify numbr of substitutents those are deactivating but ortho and para directing. `-underset(..)overset(..)(F :),-CH_(3),-overset(O)overset(||)(C)-NH_(2),-CH=CH-overset(O)overset(||)(C)-OH,-underset(..)overset(O)overset(||)(S)-C_(2)H_(5)` `-underset(O)underset(||)overset(O)overset(||)(S)-C_(2)H_(5),-overset(..)(N)=O,-overset(O)overset(||)(C)-NH_(3),-CH=CH-overset(O)overset(||)(C)-H` |
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Answer» Correct Answer - 5 `-underset(..)overset(..)(F : ), -CH=CH-overset(O)overset(||)(C)-OH,-underset(..)overset(O)overset(||)(S)-C_(2)H_(5),-overset(..)(N)=O,-CH=CH-overset(O)overset(||)(C)-H` |
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| 52. |
Examine the structural formula shown below and find out how many compounds can not give Friedel Carfts reaction . |
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Answer» Correct Answer - 5 A,B,D,E,F,G Highly diactivating and highly activating groups which form complex `AlCl_(3)` do not give friedalcrafts reaction. |
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| 53. |
Here the product X is used as aA. InsecticideB. For welding purposeC. For dry cleaningD. Artifical ripening of fruits |
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Answer» Correct Answer - C `X=C_(6)H_(6)` |
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| 54. |
Explain whether the compound shown below is aromatic or not ? |
| Answer» The compound has one 5 membered and one 3 membered ring. Five membered ring contains `6pi` electron and three membered ring contains `2pi` electrons. Hence the compound shown in aromatic. | |
| 55. |
Which of the following compounds is more acidic ? |
| Answer» By releasing `H^(+)` in (a), the anion becomes | |
| 56. |
Which one among the following gives a dicarbonyl compound with `O_(3)` followed by reduction with zinc and water.A. `C_(2)H_(6)`B. `C_(6)H_(6)`C. `C_(2)H_(2)`D. Both 2 & 3 |
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Answer» Correct Answer - D Alkane cannot undergo oxidation with `O_(3)` |
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| 57. |
In the reaction The attacking species isA. `Cl_(2)`B. `Cl^(+)`C. `Cl^(-)`D. `FeCl_(4)^(-)` |
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Answer» Correct Answer - B `Cl^(+)` is electrophile |
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| 58. |
Identify the aromaic species in the followingA. Tetra hydro furanB. PyridineC. Cyclopenta dienyl anionD. both 2 & 3 |
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Answer» Correct Answer - D `(4n+2)pi`- Huckel rule |
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| 59. |
Benzene does not undergo polymerisation due toA. Cyclic natureB. High %CC. ResonanceD. Steric effect |
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Answer» Correct Answer - C Benzene does not polymerise due to resonance |
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| 60. |
Benzene on treatment with a mixture of conc. `HNO_(3)` and con. `H_(2)SO_(4)` at 373K givesA. NitrogenzeneB. m-dinitrobenzeneC. o-dinitrobenzeneD. p-dinitrobenzene |
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Answer» Correct Answer - B `-NO_(2)` is meta orienting group |
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| 61. |
During nitration of benzene withnitrating mixture, `HNO_(3)` acts asA. BaseB. AcidC. Reducing agentD. Catalyst |
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Answer» Correct Answer - A Nitration is electrophilic substitution reaction and electrophile is nitronium ion `(-NO_(2)^(+))`. It is produced by transfer of proton from sulphuric acid to nitric acid. Hence `HNO_(3)` acts as a base. |
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| 62. |
Directing nature of substituted aromatic compound is decided by stability of `sigma`-complex or areniumion. If `sigma`-complex is stabilised at O-and P-position by attacks of electrophile then the group is O-and P-directing, but if `sigma`-complex si stabilisd at m-position the group will be meta directing on the basis of above explanation. find out correct answers of following questions. Q. Which of the following is m-directing.A. B. C. D. |
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Answer» Correct Answer - C due to reverse Hyper conjugation. |
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| 63. |
Directing nature of substituted aromatic compound is decided by stability of `sigma`-complex or areniumion. If `sigma`-complex is stabilised at O-and P-position by attacks of electrophile then the group is O-and P-directing, but if `sigma`-complex si stabilisd at m-position the group will be meta directing on the basis of above explanation. find out correct answers of following questions. Q. Which of the following is not O- and P-directingA. B. C. D. |
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Answer» Correct Answer - C Boran has no lone pair. |
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| 64. |
Which of the following statement(s) is/are correct about benzene?A. It burns with sooty flameB. it undergoes electrophilic substitution reactionC. Its resonance energy is `36` kcal `mol^(-1)`D. It is highly unsaturated and decolourises bromine water. |
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Answer» Correct Answer - A::B::C (A),(B) and (C) are correct statement. (D) is wrong due to delocalization of electrons. |
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| 65. |
It is not always easy to predict the position of attack on multiple substituted benzene. If the benzene ring bears different ortho/para directing group at the 1 and 4 position, the position, the position of further substitution is not immediately clear. sometimes steric effect determine the outcome. in other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituents are so strongly activating that no catalyst is needed to restrict the reaction to mono-substitution. It is possible to reduce the activity of such groups (by side chain reaction) so that the reaction can be stopped after mono substitution then and again by a side cahin reaction the original group is restored. effective use can sometimes be made of removable blocking groups on the ring. Q. Which of the following is the correct major product?A. B. C. D. |
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Answer» Correct Answer - B Greater extent of hyperconjugation by `-CH_(3)x`. |
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| 66. |
Correct statements about this reactionA. The correct order of rate of reaction `C_(6)H_(6) gt C_(6)D_(6) gt C_(6)T_(6)`B. `HNO_(3)` functions as an oxidising agentC. In the absence of `HNO_(3)` it is reversibleD. The electrophil in the above reactions is `I^(o+)` |
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Answer» Correct Answer - A::B::C::D Iodination is reversible and exhibits primary kinetic isotopic effect. |
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| 67. |
Generally rate of the reaction depends on the concentration ofA. B. `R-X`C. `AlCl_(3)`D. |
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Answer» Correct Answer - A::B Rate of reaction depends on concentration of reactant and substrate. |
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| 68. |
Statement-I : Nitration of toluene is easier than benzene Because Staement-II : The methyl group in touene is electron-releasingA. Statement-1, is true, statement-2 is true, statement-2 is a correct explanation for statement -1.B. Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1C. Statement-1 is true, statement-2 is false.D. Statement-1 is false, statement-2 is true. |
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Answer» Correct Answer - A `-CH_(3)` exerts +I and H.C. |
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| 69. |
Statement-1: Tropylium cation is aromatic in nature Statement-2: The only property that determines its aromatic behaviour is its planar structure.A. Statement-1, is true, statement-2 is true, statement-2 is a correct explanation for statement -1.B. Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1C. Statement-1 is true, statement-2 is false.D. Statement-1 is false, statement-2 is true. |
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Answer» Correct Answer - C Hyckel rule |
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| 70. |
The increase in stability and decrease in energy of aromatic compounds is due toA. Localisation of pi-electronsB. Delocalisation of sigma-electronsC. Localisation of sigma-electronsD. Delocalisation of pi-electrons |
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Answer» Correct Answer - D Resonance |
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| 71. |
Each of the compounds shows below has two aromatic ring. Labled as A and Identify number of compounds in which ring B is more active than ring A for electrophilic aromatic substitution reaction . |
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Answer» Correct Answer - 5 2,3,5,7,9 |
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| 72. |
Which is/are true about nitration of chlorobenzene using conc. `NO_(3)//H_(2)SO_(4)`A. Nitration is catalyzed by chloro substitution on the ring.B. Attack of `NO_(2)^(+)` occur at ortho/para position of benzene ringC. p-nitro chloro benzene is product in largest amount among three isomeric productsD. presence of Lewis acid catalyze the reaction. |
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Answer» Correct Answer - B::C Statement B & C are correct.. |
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| 73. |
Gammaxene is .. . . Isomer of benzene hexa chloride.A. `alpha`B. `beta`C. `gamma`D. `delta` |
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Answer» Correct Answer - C `gamma`-Form |
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| 74. |
`C_(6)H_(4)(CH_(3))_(2)` is present in how many isomeric forms (benzene derivatives).A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - C Ortho, meta,para |
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| 75. |
The reaction of toluene with `CI_(2)` in presence of `FeCI_(3)` gives predominantlyA. Benzoyl chlorideB. m-chlorotolueneC. Benzyl chlorideD. o-chloroluene and p-chlorotoluene |
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Answer» Correct Answer - D Cl is deactivating but ortho para director. |
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| 76. |
The dipolemoment of benzene isA. ZeroB. Less than p-dichloro benzeneC. Greater than p-dichloro benzeneD. Equal to that of chloro benzene |
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Answer» Correct Answer - A It is symmetrical & planar molecule. |
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| 77. |
Benzene is anA. [8] annuleneB. [6] annuleneC. [12] annuleneD. [4] annulene |
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Answer» Correct Answer - B Conjugated cyclic polyene with 6 pi electrons |
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| 78. |
Aromatic compounds give smoky flame becauseA. Hydrogen percentage is moreB. Carbon percentage is moreC. DelocalisationD. Saturation. |
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Answer» Correct Answer - B Carbon percentage is more |
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| 79. |
Bond length of C-C in benzeneA. `1.34`A^(@)`B. `1.39A^(@)`C. `1.54A^(@)`D. `1.20A^(@)` |
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Answer» Correct Answer - B All bond length are same in between single and double bonds |
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| 80. |
Carbon-carbon bond length is same inA. Butene-1B. BenzeneC. Butene-2D. Propyne-1 |
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Answer» Correct Answer - B Due to resonance |
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| 81. |
Identify the position where E.A.S. can take place.A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A Position 1 has high electron density due to +M effect shown by amine group and +I effect due to `CH_(3)` group |
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| 82. |
Rank in order of increasing rate of reaction towards EAS with bromine in the presence of `FeBr_(3)` A. BltAltCB. BltCltAC. AltBltCD. AltCltB |
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Answer» Correct Answer - A EDG increase reactivity and EWG decrease reactivity towards EAS. |
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| 83. |
A & B respectively areA. Hexachlorocyclohexane & `C_(6)H_(5)Cl`B. Chlorobenzene & HexachlorocyclohexaneC. o- and p- Dichlorobenzene & chlorobenzeneD. Chlorobenzene & `C_(6)H_(5)Cl_(6)` |
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Answer» Correct Answer - A A=Free Radical addition B=Electrophylic substitution |
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| 84. |
`Aoverset("soda lime")toC_(6)H_(6)overset(Cl_(2),hv)toB`, In this reaction A and B are respectively.A. Phenol, chlorobenzeneB. Chlorobenzene, lindaneC. Sodium benzoate, BHCD. `C_(2)H_(2)&BHC` |
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Answer» Correct Answer - C `C_(6)H_(5)COONaunderset(CaO)overset(NaOH)toC_(6)H_(6)overset(Cl_(2)//hv)toC_(6)H_(6)Cl_(6)` |
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| 85. |
The end product of the reaction `C_(6)H_(6)+Cl_(2)overset("Sunlight")to`? IsA. `C_(6)H_(5)Cl`B. `O-C_(6)H_(4)Cl_2`C. `C_(6)H_(6)Cl_(6)`D. `P-C_(6)H_(4)Cl_(2)` |
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Answer» Correct Answer - C Benzene undergoes addition reaction with `Cl_(2)` in presence of light |
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| 86. |
Which position gives major product when `E^(+)` attack the following compoundA. W and BB. XC. YD. `Z` |
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Answer» Correct Answer - D Due to `+M` and steric reasons. |
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