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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. |
Which of the following compounds is the most reactive towards nitration with a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)` under identical conditions?A. `C_(6)H_(6)`B. `C_(6)H_(5)NO_(2)`C. `C_(6)H_(5)CH_(3)`D. `C_(6)H_(5)CCl_(3)` |
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Answer» Correct Answer - C `-NO_(2)` and `-C Cl_(3)` groups are strongly deactivating while `-CH_(3)` group is weakly activating. |
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| 2. |
When phenol is heated with zinc dust the major product formed isA. benzaldehydeB. phenolphthaleinC. benzeneD. biphenyl |
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Answer» Correct Answer - C `C_(6)H_(5)OH+Znoverset(Delta)toZnO+C_(6)H_(6)` |
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| 3. |
Given the major product of the following reaction : A. B. C. D. |
| Answer» Correct Answer - A | |
| 4. |
Select the final product of following sequence of reaction A. B. C. D. |
| Answer» Correct Answer - A | |
| 5. |
+HCHOoverset(HCl)to (A) ("Final product")`A. B. C. D. |
| Answer» Correct Answer - C | |
| 6. |
Phenol on heating with `NaNO_(2)` and a few drops of conc. `H_(2) SO_(4)` gives :A. p- NitrophenolB. p - NitrosophenolC. o- NitrophenolD. m- Nitrosophenol |
| Answer» Correct Answer - B | |
| 7. |
The major product of the reaction is : A. B. C. D. none of thses |
| Answer» Correct Answer - B | |
| 8. |
Major product of the reaction is : A. B. C. D. |
| Answer» Correct Answer - D | |
| 9. |
The major product fromed in the reacation A. B. C. D. |
| Answer» Correct Answer - B | |
| 10. |
The major product fromed in the reacation `C_(6) H_(5) - overset(o+)N-=N overset(ө)Cl+ H_(3) PO_(2) + H_(3) PO_(2) + H_(2)O to` is:A. `C_(6)H_(5) OH`B. `C_(6)H_(5)Cl`C. `C_(6)H_(6)`D. `C_(6)H_(5)C_(6)H_(5)` |
| Answer» Correct Answer - C | |
| 11. |
The final product of the given reaction sequence : A. B. C. D. |
| Answer» Correct Answer - A | |
| 12. |
Which of the following compounds will form a yellow-coloured oily compound on treatment with `NaNO_(2)` and HCl at `0-5^(@)C` ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 13. |
Aniline react with `NaNO_(2)` and dil. HCl at `0-5^(@)C` to from :A. p-nitro anilineB. 2, 4,6-trinitroatanilineC. benzene diazoniumD. benzene |
| Answer» Correct Answer - C | |
| 14. |
The major product fromed in the reaction : A. B. C. D. |
| Answer» Correct Answer - A | |
| 15. |
Which of the following is foomed as a product when m-dinitrobenzene is treated with `(NH_(4))_(2)S` ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 16. |
Which one of the following aryl amine undergoes diazotisation most readily ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 17. |
Which one of the following substrate will not form benzyne when treated with `NaNH_(2)` ?A. `C_(6)H_(5)CI`B. C. D. |
| Answer» Correct Answer - D | |
| 18. |
underset (Hr_(2))overset(Br_(2))to Xunderset(H_(3)PO_(2))overset(NaNO_(2)//Hcl(0-5^(@)C))to Y` The end product Y is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 19. |
In the given reaction sequence `C_(6)H_(5)NO_(2)overset(Sn//HCl)to A overset(NaNO_(2) + HCl)to B overset(Cu CN//HCN)toCunderset(Delta) overset(H_(2)O///overset(o+)H)toD` which one is not correct ?A. A is `C_(6) H_(5)NH_(2)`B. B is `C_(6) H_(5)- overset(o+)N -=N overset(ө)Cl`C. C is `C_(6) H_(5) CH_(2)CN`D. D is `C_(6) H_(5) COOH` |
| Answer» Correct Answer - C | |
| 20. |
underset (Conc. H_(2)SO_(4))overset(Conc. HNO_(3))toP underset(Delta)overset(Sn, Conc. HCl)toQ` The product Q is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 21. |
Consider the following sequence of reaction `C_(6)H_(5)NH_(2)underset(Delta)overset(Ac_(2)O)toA underset(H_(2)SO_(4))overset(Conc.HNO_(3))to underset("Major")B overset(aq.H_(2)SO_(4))to underset("Major")C` The major final product (C) is :A. B. C. D. |
| Answer» Correct Answer - C | |
| 22. |
Examine given sequence of reaction carefully : `overset(Sn+HCl)to A overset(HNO_(2))to Boverset(H_(2)O)toCunderset(100^(@)) overset(Conc. H_(2)SO_(4))toD underset("excess")overset(Br_(2)+ FeBr_(3))toE` Converstion of B to C is which type of reaction ?A. electrophilic aromatic substitution reactionB. nucleophilic aromatic substition reactionC. free radiual substitutionD. nucleophilic acyl substitution reaction |
| Answer» Correct Answer - B | |
| 23. |
Examine given sequence of reaction carefully : `overset(Sn+HCl)to A overset(HNO_(2))to Boverset(H_(2)O)toCunderset(100^(@)) overset(Conc. H_(2)SO_(4))toD underset("excess")overset(Br_(2)+ FeBr_(3))toE` Formation of A from nitrobenzene cannot be achieved from :A. `Zn +HCl`B. `Fe + HCl`C. `NaBH_(4)`D. `Li AlH_(4)` |
| Answer» Correct Answer - C | |
| 24. |
Chlorination of benzene in the presence of halogen carrier is an exampole of :A. aromatic nuleeophilic substictutionB. aromtic electrophilic substituionC. aromatic anuclephilic additionD. aromatic electrophilic addition |
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Answer» Correct Answer - b |
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| 25. |
Which of the following species is aromatic ?A. B. C. D. |
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Answer» Correct Answer - c |
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| 26. |
In the shalogenation of aromatic nucleus, the halogen carrier, is used to generate the species :A. `CI^(.)`B. `CI^(+)`C. `CI^(-)`D. `CI` |
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Answer» Correct Answer - b |
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| 27. |
Rank the following compound in decreasing order of reaction reactivity in electrophilite aromatic substitution reaction : A. ` 3 gt 1 gt 2gt 4`B. ` 4 gt 3 gt 2 gt1`C. ` 3 gt 1 gt 4 gt 2 `D. `1 gt 3 gt 4gt 2` |
| Answer» Correct Answer - C | |
| 28. |
Arrange the following groups in order of decresing 0- and p- directing strength : `overset(..)(NH_(2)),-CI,overset(* *)underset(* *)(-OH),-R`A. `-CIgtoverset(* *)underset(* *)(-OH)gt-Rgtoverset(* *)(-NH_(2))`B. `overset(* *)(-NH_(2))gt-Rgt-CIgtoverset(* *)underset(* *)(-NH_(2))`C. `overset(* *)(-NH_(2))gtoverset(* *)underset(* *)(-OH)gt-CIgt-R`D. `overset(* *)(-NH_(2))gtoverset(* *)underset(* *)(-OH)gt-Rgt-CI` |
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Answer» Correct Answer - d |
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| 29. |
The correct order of decresing reactivity of anisole (I), benzene (II) and nitrobenzene (III) towards aromatic substitution with a given electrophile isA. `(II)lt(III)lt(I)`B. `(III)gt(II)gt(I)`C. `(II)gt(I)gt(III)`D. `(I)gt(III)gt(III)` |
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Answer» Correct Answer - D The `-OCH_(3)` group of anisole is moderately activating while the `-NO_(2)` group of nitrobenzene is strongly deactivating. |
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| 30. |
Devise a series of reaction to convert benzene into meta - chlorobromobenzene. Select rangent and condition from following table listing them in the order of use. A. 1 them 2 them 6B. 2 them 8 then 4 then 3 them 9C. 8 then 4 then 10 then 2 then 2 then 3 then 9D. 8 then 2 then 4 then 3 then 9 |
| Answer» Correct Answer - D | |
| 31. |
The products formed are :A. `CH_(3)-overset(O)overset(||)(C)-CHO`B. `CHO-CHO`C. `CH_(3)-overset(O)overset(||)(C)-overset(O)overset(||)(C)-CH_(3)`D. HCOOH |
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Answer» Correct Answer - `(a,b)` |
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| 32. |
Which of the followin groups is called benzo?A. `C_(6)H_(5)underset(|)overset(|)(C)-`B. `C_(6)H_(5)overset(|)(C)H-`C. `C_(6)H_(5)CH_(2)-`D. `C_(6)H_(5)-` |
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Answer» Correct Answer - A Benzo is a trivalent group derived from tuluene. (2) is benzal (3) is benzyl and (4) is phenyl. |
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| 33. |
Thre resonance energy of benzene is approximatelyA. 18 kcal `mol^(-1)`B. 37 kcal `mol^(-1)`C. 54 kcal `mol^(-1)`D. 48 kcal `mol^(-1)` |
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Answer» Correct Answer - B `Delta_(h)H^(ɵ)` of benzene is less than the expected value by `36 kcal mol^(-1)` Thus this is equal to its resonance energy. |
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| 34. |
Calculate `Delta_(h)H^(ɵ)` for the addition of 1 mol of `H_2` to (i) benzene `(C_(6)H_(6))` and (ii) 1,3-cyclohexadiene `(C_(6)H_(8))` from frigure. Strategy (i): Target is to find `Delta_(h)H^(ɵ)` of the following reaction benzene `+H_(2)to1,3-`Cyclohexadiene Thus, look for the data involving these two compound. strategy (ii). We need to find `Delta_(h)H^(ɵ)` of the following reaction: `1,3-C_6H_8+H_2toC_6H_(12)` Thus, we look for the data involving these two compounds. |
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Answer» (a). `C_(6)H_(6)+3H_2toC_(6)H_(12)`, `Delta_(h)H^(ɵ)=-208Kgmol^(-1)` (b). `1.3-C_6H_6+2H_2toC_6H_(12)`, `Delta_(h)H^(ɵ)=-232kJmol^(-1)` Substracting second equation (b) from the first (a), we get `C_6H_6+H_2to1,3-C_6H_6`, `Delta_(h)H^(ɵ)24kJmol^(-1)` (ii). (a). `1,3-C_6H_6+2H_2toC_6H_(12)toC_6H_(12)`, `Delta_(h)H^(ɵ)-232mol^(-1)` (b). `C_6H_(10)+H_(2)toC_6H_(12)`, `Delta_(h)H^(ɵ)-120kJmol^(-1)` Subtracting second equation (b) from the first (a), we get `1,3-C_6H_8+H_2toC_6H_(10)`, `Delta_(h)H^(ɵ)112kJmol^(-1)` |
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| 35. |
Predict the product of the following reaction: Benzene `+H_2to`? Strategy: Adding 1 mol `H_2` to benzene is endothermic while adding 1 mol `H_2` to chlohexadiene is exathermic Thus, when benzene is reduced to diene, the cyclohexadiene is reduced all the way to cyclohexane before more benzene reacts. |
| Answer» According to the rate of hydrogenation and the number of moles of hydrogen used (3 mol `H_2` for every 1 mol of cyclohexane from benzene), for every one mole of benzene, one third of a mole of cyclohexane would be isolated and two third of a mole of benzene would be recovered. | |
| 36. |
Using the following data, calculate the heat of combustion of cyclohexatrieneandalso find the resonance energy of benzene. `Delta_(C)H^(ɵ)` (Benzene)`=-789kcal mol^(-1)` Combustion contribution `(C-H)=-54.0kcal` Combustion contribution `(C-C)=-49.3kcal` Combustion contribution `(C=C)=-117.7kcal` Strategy: First write a balanced equation for the combustion of one mole of cyclohexatriene: Nowusing the structure, calculate the combution contribution for each bond and do the total for the molecule. |
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Answer» Three `C=C` bonds`=3xx(-117.7)=-353.1kcalmol^(-1)` Three `C-C` bonds`=3xx(-49.3)=-147.9kcalmol^(-1)` Six `C-H` bonds`=6xx(-54.0)=-324.0kcalmol^(-1)` `overline(S um=-825.0kcalmol^(-1))` Thus, the calculated heat of combustion for cyclohexatriene is `-825.0kcalmol^(-1)` Defference`=[(-789.1 kcal mol^(-1))-(-825.0 kcal mol^(-1))]` `=35.9 kcal mol^(-1)` |
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| 37. |
Which of the following molecules is most suitable to disperse benzen in water?A. B. C. D. |
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Answer» Correct Answer - c |
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| 38. |
Which sequence of steps describes the best synthesis of compound A. B. C. D. |
| Answer» Correct Answer - C | |
| 39. |
How might one best accomplish the following synthesis ? A. (i) `C_(4)H_(9) + AlCl_(3) , (ii)HNO_(3) and heat , (iii) "excess of `H_(2)` and Pt catalyst"`B. (i) `HNO_(3) and heat , (ii)C_(4) H_(9) Cl + AlCl_(3), (iii) "excess of `H_(2)` and Pt catalyst"`C. (i) `C_(3) H_(7) COCl + AlCl_(3) , (ii)HNO_(3) and heat , (iii) "excess of `H_(2)` and Pt catalyst"`D. (i) `HNO_(3) and heat , (ii)C_(3) H_(7) COCl + AlCl_(3) , (iii) "excess of `H_(2)` and Pt catalyst"` |
| Answer» Correct Answer - C | |
| 40. |
Which is the best synthesis of A. B. C. D. All are correct |
| Answer» Correct Answer - B | |
| 41. |
Which is best synthesis of A. `underset(FeBr_(3))overset(Br_(2))to underset(H_(2)SO_(4))overset(HNO_(3))to underset(H_(2)So_(4))overset(HNO_(3))to underset(CH_(3)OH)overset(CH_(3)overset(o+)Ooverset(ө)Na)to`B. `underset(H_(2)SO_(4))overset(HNO_(3))to underset(H_(2)SO_(4))overset(HNO_(3))tounderset(FeBr_(3))overset(Br_(2))to underset(CH_(3) OH)overset(CH_(3)overset(ө)Ooverset(o+)Na)to`C. `underset(H_(2)SO_(4))overset(HNO_(3))to underset(FeBr_(3))overset(Br_(3))tounderset(H_(2)SO_(4)) overset(HNO_(3))to underset(CH_(3) OH)overset(CH_(3)overset(ө)Ooverset(o+)Na)to`D. `underset(H_(2)SO_(4))overset(HNO_(3))to underset(FeBr_(2))overset(Br_(2))tounderset(CH_(3))overset(Noverset(o+)a overset()OCH_(3))to underset(H_(2)So_(4))overset(HNO_(3))to` |
| Answer» Correct Answer - A | |
| 42. |
Which of the following procedures would be best for achieving for following reaction ? A. (i)`KHO and heat , (ii) CH_(3) - C -= C- Br`B. (i) `KMnO_(4) and heat , (ii) CH_(3) c -= overset(ө) , (iii)"excess" H_(2) O`C. (i) `MBS "in" CCl_(4) and heat (ii) CH_(3) -C -= overset(ө)`D. (i) `Mg "in ether" , (ii) CH_(3) - C -=overset(ө) , (iii) "excess" H_(3) PO_(4)` |
| Answer» Correct Answer - C | |
| 43. |
The best method for the perparation of chlorobenzene is :A. B. C. D. |
| Answer» Correct Answer - A | |
| 44. |
Which of the following produre would be the best for perparation of a phenyl benzyl ether `(C_(6) H_(5)OCH_(2)C_(6) H_(5))` ?A. `C_(6) H_(5)Cl + C_(6)H_(5)CH_(2)overset(ө)O`B. `C_(6)H_(5) overset(ө)O + C_(6)H_(5)CH_(2) - Cl`C. `2C_(6)H_(5)Cl + Na_(2)O`D. `2C_(6) H_(5)MgBr+ HCHO` |
| Answer» Correct Answer - D | |
| 45. |
For this reaction ? , the best reactnats are :A. `C_(6)H_(5) Cl + C_(6) H_(5)-overset(O)overset(||)C- Cl, AlCl_(3)`B. `C_(6)H_(5)-overset(O)overset(||)C- CH_(3) + Cl_(2)., FeCl_(3)`C. `C_(6) H_(5) - Cl - C_(6)H_(5) + Cl_(2), FeCl_(3)` followed by oxidationD. none the yield the desired product |
| Answer» Correct Answer - B | |
| 46. |
Birch reduction of nitrobenzne will produce :A. B. C. D. |
| Answer» Correct Answer - D | |
| 47. |
`C_(6)H_(6)+CI_(2)overset(UVLight)rarr` Product In above reaction product is .A. `C_(6)H_(5)Cl`B. `o-C_(6)H_(4)Cl_(2)`C. `p-C_(6)H_(4)Cl_(2)`D. `C_(6)H_(6)Cl_(6)` |
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Answer» Correct Answer - D When treated with chlorine in the presence of sunlight, benzene forms benzene hexachloride `C_(6)H_(6)Cl_(6)`: `C_(6)H_(6)+3Cl_(2)overset(hv)toC_(6)H_(6)Cl_(6)` it is a free radical addition reaction. |
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| 48. |
Gammexne is ,A. hexachlorobenzeneB. benzene hexachlorideC. p-dichlorobezeneD. chlorobenene |
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Answer» Correct Answer - b |
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| 49. |
Benzene adds on ozone to form aA. Mono-ozonideB. diozonideC. triozonideD. polyozonide |
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Answer» Correct Answer - 3 It forms triozonide `C_(6)H_(6)(O_(3))_(3)` as it has three pi bonds. |
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| 50. |
Which of the following cations are more stable than benzyl cation?A. B. C. D. |
| Answer» Correct Answer - A::C::D | |