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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.
| 1. |
The correct order of reactivity towards the electrophilic substitiution of the compounds aniline(I),benzene(II) and nitro-benzene(III) isA. IgtIIgtIIIB. IIIgtIIgtIC. IIgtIIIgtID. IltIIgtIII |
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Answer» Correct Answer - A `-NH_(3)` group is ring activating and `-NO_(2)` is strongly deactivating. |
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| 2. |
Cyclo butadiene isA. AromaticB. AliphaticC. anti aromaticD. heterocyclic |
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Answer» Correct Answer - C Cyclic with `4npie^(-)` |
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| 3. |
What is the electrophile in the nitration of benzeneA. `overset(+)(N)O_(2)`B. `overset(+)(N)O`C. `NO`D. `overset(**)(N)O_(2)` |
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Answer» Correct Answer - A itronium Ion |
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| 4. |
Identify the position where electrophilic aromatic substitution EAS) is most favourableA. AB. BC. CD. D |
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Answer» Correct Answer - B Due to steric reason. |
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| 5. |
A general mechanism for aromatic electrophilic substitution reaction is. (`K_(1)` and `K_(2)` are rate constant for the forward reaction) also C-D bond in harder to break than a C-H bond, and consequently reaction in which C-D bond broken proceed more slowly than the reaction in which C-H bond are broken. However experimetns reveal that nitration of `C_(6)H_(6) and C_(6)D_(6)` proceeds at equal rates while the same is not true for sulphonation of `C_(6)H_(6)` and `C_(6)D_(6)`. Q. In the nitration reactionA. `k_(1)=k_(2)`B. `k_(1) gt k_(2)`C. `k_(1) lt k_(2)`D. `k_(1) underset(~)(-) k_(2)` |
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Answer» Correct Answer - C In electrophylic substitutions step 1 is RDS. |
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| 6. |
A general mechanism for aromatic electrophilic substitution reaction is. (`K_(1)` and `K_(2)` are rate constant for the forward reaction) also C-D bond in harder to break than a C-H bond, and consequently reaction in which C-D bond broken proceed more slowly than the reaction in which C-H bond are broken. However experimetns reveal that nitration of `C_(6)H_(6) and C_(6)D_(6)` proceeds at equal rates while the same is not true for sulphonation of `C_(6)H_(6)` and `C_(6)D_(6)`. Q. When one of the carbons of benzene is labelled `(C^(14))`, in which case we expect greater yield of the product obtained at labelled carbon.A. NitrationB. SulphonationC. Both have equal chanceD. It depends on temperature. |
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Answer» Correct Answer - C Both in nitration and sulphonation have equal chance of greater yield of products obtained at labelled carbon. |
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| 7. |
A general mechanism for aromatic electrophilic substitution reaction is. (`K_(1)` and `K_(2)` are rate constant for the forward reaction) also C-D bond in harder to break than a C-H bond, and consequently reaction in which C-D bond broken proceed more slowly than the reaction in which C-H bond are broken. However experimetns reveal that nitration of `C_(6)H_(6) and C_(6)D_(6)` proceeds at equal rates while the same is not true for sulphonation of `C_(6)H_(6)` and `C_(6)D_(6)`. Q. What can be inferred regarding mechanism of sulphonation of `C_(6)H_(6) and C_(6)D_(6)`A. Activation energy for the first step in `C_(6)H_(6)` is greater than that of `C_(6)D_(6)`B. Activation energy for the first step in `C_(6)H_(6)` is smaller than that of `C_(6)D_(6)`C. When benzene is sulphonated, Ea (i) and Ea (ii) are closer than they are when `C_(6)D_(6)` is sulphonated.D. When `C_(6)D_(6)` is sulphonated Ea (i) and Ea (ii) comes very close and `K_(2)` approaches `K_(1)`. |
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Answer» Correct Answer - D `r_(1) cong r_(2)`. |
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| 8. |
Lindane is also represented asA. 6,6,6B. BHCC. GammaxeneD. all of these |
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Answer» Correct Answer - D BHC (or) Gammaxene (or) 6,6,6 is called lindane |
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| 9. |
Which of the following compound is expected to undergo fastest electrophilic aromatic substitution than unsubstituted benzeneA. B. C. D. |
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Answer» Correct Answer - B::C Group which increases electron density on benzene ring help the compound to undergo faster electrophilic aromatic substitution. |
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| 10. |
For an electrophilic substitution reaction , the presence of a halogen atom in the benzene ring …..A. deactivates the ring by inductive effectB. deactivates the ring by resonanceC. increases the charge density at ortho and para position relative to meta position by resonanceD. directs the incoming electrophile to meta position by increasing the charge density realtive to ortho and para position. |
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Answer» Correct Answer - A::C `-X`, is deactivating group and O,P-directing group. |
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| 11. |
What will be the product obtain as a result of the following reaction? A. B. C. D. |
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Answer» Correct Answer - D Secondary carbocation is most stable |
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| 12. |
Which of the following cases, reactant and product are correctly matched.A. B. C. D. |
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Answer» Correct Answer - A::B::C::D Cyclo propyl methyl carbo cation can be rearranged to cyclo butyl carbo cation. |
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| 13. |
In which of the following reaction, aromatic character is retained?A. `C_(6)H_(6)overset(H_(2)//Ni)toX`B. `C_(6)H_(6)underset(Zn//H_(2)O)overset(O_(3))toY`C. `C_(6)H_(6)underset(AlCl_(3))overset(CH_(3)COCl)toQ`D. `C_(6)H_(6)underset("light")overset(Cl_(2))toR` |
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Answer» Correct Answer - C Acetylation is substitution. |
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| 14. |
Benzene is ____molecule.A. TetrahedralB. PlanarC. TrigonalD. Square planar |
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Answer» Correct Answer - B All carbons are `sp^(2)` hybridised |
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| 15. |
Which of the following is the correct IUPAC name of the compound A. 1,2-dichloro-4-(N,N-dimethyl) anilineB. Dimethyl-(3,4-dichlorophenyl) amineC. 3,4-dichloro-N,N-dimethyl anilineD. N,N-dimethylamino-3,4-dichlorobenzene |
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Answer» Correct Answer - C IUPAC rules |
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| 16. |
IUPAC name of the following compound isA. 2,4-difluoro-1-sulpho benzeneB. 2,4-difluoro benzene sulphonic acidC. Benzene-2,4-difluoro sulphonic acidD. All the above |
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Answer» Correct Answer - B `-SO_(3)H` is principal functonal group in the molecule |
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| 17. |
What is number of electron delocalising in benzene molecule.A. 3B. 6C. zeroD. 12 |
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Answer» Correct Answer - B `6pi`-electrons |
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| 18. |
IUPAC name of the following compounds is A. Heptyl benzneB. 2-Benzyl heptaneC. 2-Phenyl heptaneD. 1-heptyl benzene |
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Answer» Correct Answer - C Alkyl chain has more carbons |
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| 19. |
Which among the following is very strong o-p-directing groups?A. `-Cl`B. `-OR`C. `-NH_(2)`D. `-NHR` |
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Answer» Correct Answer - D in `overset (..)(N)HR`, R exertrs +I |
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| 20. |
`C_(6)H_(6)` is very good industrial solvent forA. OilB. FatC. RubberD. All |
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Answer» Correct Answer - D Benzene is Non polar solvent |
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| 21. |
`-COOH` group in electrophilic substitution directs the incoming groups toA. o-positionB. p-positionC. m-positionD. o-and p-position |
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Answer» Correct Answer - C `-COOH` is meta orienting group |
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| 22. |
Which of the following cannot form ozonideA. BenzeneB. EtheneC. EthyneD. Ethane |
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Answer» Correct Answer - D Alkane cannot undergo oxidatio with `O_(3)`. |
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| 23. |
how many monosubstituted products can be derived frombenzeneA. oneB. twoC. ThreeD. Four |
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Answer» Correct Answer - A All the carbons are same type |
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| 24. |
Match the following reactants in column I with the corrosponding reaction products in column II. the Correct match isA. `{:(A,B,C,D),(a,b,c,d):}`B. `{:(A,B,C,D),(b,c,d,a):}`C. `{:(A,B,C,D),(c,d,b,a):}`D. `{:(A,B,C,D),(d,c,b,a):}` |
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Answer» Correct Answer - D A-is chlorination. B- is fridel-craft alkylation C-is fridel-craft acylation D- tolen undergoes oxidation with `KMnO_(4)`. |
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| 25. |
On the basis of molecular orbital treatment of various aromatic compound, it has been observed that an aromatic compound must fulfil the following theoritical requirements It must have an uninterrupted cyclic cloud of `pi`-electrons above and below the plane of the molecule (often called as `pi`-cloud). Let us look what does this mean? (i). for the `pi`-cloud to be cyclic, the molecule must be cyclic. (ii). For the `pi`-cloud to be uninterrupted, every atom int he ring must have a p-orbital iii). for the `pi`-cloud to be fomred, each p-orbital must be able to overlap with the p-orbitals on either side of it. therefore, the molecule must be planar. Q. A. AromaticB. Anti-aromaticC. Non-aromaticD. All the above |
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Answer» Correct Answer - A Aromatic and follows `(4n+2)pi` electrons. |
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| 26. |
On the basis of molecular orbital treatment of various aromatic compound, it has been observed that an aromatic compound must fulfil the following theoritical requirements It must have an uninterrupted cyclic cloud of `pi`-electrons above and below the plane of the molecule (often called as `pi`-cloud). Let us look what does this mean? (i). for the `pi`-cloud to be cyclic, the molecule must be cyclic. (ii). For the `pi`-cloud to be uninterrupted, every atom int he ring must have a p-orbital iii). for the `pi`-cloud to be fomred, each p-orbital must be able to overlap with the p-orbitals on either side of it. therefore, the molecule must be planar. Q. Cyclo-octatetraene is:A. AromaticB. Anti-aromaticC. Both 1 and 2D. Non-aromatic |
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Answer» Correct Answer - D Non-aromatic due to tub shape |
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| 27. |
On the basis of molecular orbital treatment of various aromatic compound, it has been observed that an aromatic compound must fulfil the following theoritical requirements It must have an uninterrupted cyclic cloud of `pi`-electrons above and below the plane of the molecule (often called as `pi`-cloud). Let us look what does this mean? (i). for the `pi`-cloud to be cyclic, the molecule must be cyclic. (ii). For the `pi`-cloud to be uninterrupted, every atom int he ring must have a p-orbital iii). for the `pi`-cloud to be fomred, each p-orbital must be able to overlap with the p-orbitals on either side of it. therefore, the molecule must be planar. Q. The stability order of the three compoundsA. IgtIIgtIIIB. IgtIIIgtIIC. IgtII=IIID. I=IIIgtII |
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Answer» Correct Answer - B I. aromatic, II. Anti aromatic, III. Non-aromatic aromatic is highly stable. |
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| 28. |
Toluene on oxidation with dilute `HNO_(3)` givesA. BenzaldehydeB. phenolC. NitrotolueneD. Benzoic acid |
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Answer» Correct Answer - D side chain oxidation. |
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| 29. |
Which of the following applies corretly to tolueneA. When heated with limited amount of chlorine as Benzyl chloride is formedB. When trated with `Cl_(2)` in presence of `ZnCl_(2)`, ortho and para chloro toluene are formedC. When heated with `AlCl_(3)` alone it undergoes disproportionationD. when treated with conc. `HNO_(3)` in the presence of conc. `H_(2)SO_4`. All three isomeric nitrotoluenes are formed with their relatie yield paragtmetagtortho |
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Answer» Correct Answer - A::B `CH_(3)` is an ortho-para director. Benzylic chlorination takes place at high temperature in the absence of Louis acid. |
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| 30. |
Write the major product of the following reaction `C_(6)H_(5)CH_(2)CH_(3)underset(NaCN)overset(Br_(2)//Delta)to`A. `C_(6)H_(5)-underset(CN)underset(|)(CH)-CH_(3)`B. `C_(6)H_(5)-CH_(2)-CH_(2)-CN`C. `o-(CN)C_(6)H_(4)CH_(2)CH_(3)`D. `m-(CN)C_(6)H_(4)CH_(2)CH_(3)` |
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Answer» Correct Answer - A Benzylic substitution followed by nucleophilic substitution. |
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| 31. |
Benzene contains double bonds but does not give addition reactions becauseA. Double bonds in benzene rinig are strongB. Double bonds change their position rapidlyC. Resonance lowers the energy of benzene molecule and leads to greater stabilizationD. Benzene has cumulative double bonds. |
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Answer» Correct Answer - C Stability by resonance. |
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| 32. |
Addition of `Cl_(2)` or `Br_(2)` (in the presence of sunlight) to the benzene followA. Free radical additionB. Electrophilic additionC. Nucleophilic additionD. Electrophilic substitution |
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Answer» Correct Answer - A Free radical addition. |
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| 33. |
The descending order of reactivity of `C_(2)H_(6),C_(2)H_(4),C_(2)H_(2) and C_(6)H_(6)` towards addition reaction isA. `C_(2)H_(4)gtC_(2)H_(2)gtC_(6)H_(6)gtC_(2)H_(6)`B. `C_(2)H_(2)gtC_(2)H_(4)gtC_(6)H_(6)gtC_(2)H_(6)`C. `C_(6)H_(6)gtC_(2)H_(6)gtC_(2)H_(4)gtC_(2)H_(2)`D. `C_(2)H_(6)gtC_(2)H_(4)gtC_(2)H_(2)gtC_(6)H_(6)` |
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Answer» Correct Answer - A Alkenegtalkynegtbenzenegtalkane |
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| 34. |
In which of the following reation meta substitution product predominateA. B. C. D. |
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Answer» Correct Answer - A EDG attaches to benzene ring gives O,P directing product. EWG attaches to benzene ring gives M directing product. |
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| 35. |
Select the compound/ions which is/are anti-aromaticA. B. C. D. |
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Answer» Correct Answer - A::D For aromatic-compound should be cyclic, `sp^(2)` hybridised, planar, `(4n+2)pie^(-)` for anti-aromatic-compound should be cyclic, `sp^(2)` hybridised, planar, `(4n)pie^(-)` Hence compound A and D has anti-aromatic character. |
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| 36. |
Product of the reaction is A. B. `(CH_(3))_(2)C=CH_(2)`C. D. |
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Answer» Correct Answer - A Nitration mixture gives `NO_(2)^(+)` as a electrophile. Tert-Butyl group was replaced by `NO_(2)`, then it makes benzene ring as deactivating group. |
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| 37. |
In this, sulhonation is most favorable at the carbon number.A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B `SO_(3)` can attack on 4th and 2nd position but due to steric crowding 2nd position is most favourable.. |
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| 38. |
Benzen is purified byA. DistillationB. Fractional distillationC. EvaporationD. Sublimation |
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Answer» Correct Answer - B impure benzene `underset("distillation")overset("fractional")to` purebenzene |
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| 39. |
The homologue of toluene isA. Ethyl benzeneB. Methyl benzeneC. PhenolD. Nitro benzene |
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Answer» Correct Answer - A `C_(6)H_(5)-CH_(2)-CH_(3)` |
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| 40. |
Arrange the following set of compounds in the order of their decreasing relative reactivity with an electrophile . Give reason. A. IgtIIgtIIIB. I=II=IIIC. IltIIltIIID. IgtIIltIII |
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Answer» Correct Answer - A For EDG more ring activity. |
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| 41. |
Which of the following products can be obtained by reductive ozonolysis of o-xylene ? |
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Answer» 1,2-Dimethylbenzene (o-Xylene) on ozonolysis gives glyoxal, methyl glyoxal and dimethyl glyoxal in 3:2:1 molar ratio. In proves the existance of two resonance structures for benzene and its derivatives. |
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| 42. |
Which of the following species is expected to yield maximum percentage of meta substitution product.A. `ArCH_(3)`B. `ArCH_(2)Cl`C. `ArCHCl_(2)`D. `ArC Cl_(3)` |
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Answer» Correct Answer - D `-C Cl_(3)` has a maxium electron with drawing power |
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| 43. |
The order of reactivities towards ESR of the various speciesA. `-O^(-) gt -OH gt -OCOCH_(3) gt -COCH_(3)`B. `-OH gt-O^(-) gt -OCOCH_(3) gt -COCH_(3)`C. `-OH gt -O^(-) gt -COCH_(3) gt -OCOCH_(3)`D. `-O^(-) gt -COCH_(3) gt -OCOCH_(3) gt -OH` |
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Answer» Correct Answer - A `-OH gt O^(-) gt -OCH_(3) gt -OCOCH_(3)`. |
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| 44. |
In the nitration mixture concentrated sulphuric acid is used.A. As a sulphonating agentB. As dehydrating agentC. For the formation of nucleophileD. As a solvent |
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Answer» Correct Answer - B Conc `H_(2)SO_(4)` is a dehydrating agent. |
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| 45. |
the product B isA. 3-Nitrobenzoic acidB. 3-NitrotolueneC. 4-NitrotolueneD. 4-Nitrobenzoic acid |
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Answer» Correct Answer - A A=Benzoic acid B=Metanitro benzoic acid |
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| 46. |
Among the following, the compound that can be most readily sulphonated is:A. BenzeneB. Methoxy benzeneC. TouleneD. Chloro benzene |
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Answer» Correct Answer - B Ring activating group=Methoxy |
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| 47. |
With which one of the following reagents benzene does not undergo substitution reactionA. Fuming sulphuric acidB. Nitration mixtureC. Chlorine in presence of lightD. Acyl halide in presence of `AlCl_(3)` |
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Answer» Correct Answer - C In presence of sunlight addition occurs through free radical mechanism. |
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| 48. |
Three mole of glyoxal are obtained by the ozonolysis, followed by hydrolysis (in presence of Zn) ofA. `C_(2)H_(2)`B. `C_(2)H_(4)`C. `C_(6)H_(6)`D. `C_(6)H_(12)` |
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Answer» Correct Answer - C Benzene |
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| 49. |
Oxidizing agent required for these conversion are, A. B. C. D. |
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Answer» Correct Answer - B `NO_(2)` group acts o,p- directing and ring deactiva group. |
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| 50. |
The conversion Can be effected usingA. `Br_(2)//C Cl_(4)`B. `Br_(2)//H_2O`C. `Br_(2)//Fe`D. `Br_(2)//"benzoyl peroxide"` |
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Answer» Correct Answer - C In pressure of catalyst, electrophilic substitution occurs. |
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