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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 sequence of reagents for the following conversion will be A. `[Ag(NH_(3))_(2)]^(+)OH^(-),H^(+)//CH_(3)OH,CH_(3)MgBr`B. `CH_(3)MgBr,H^(+)//CH_(3)OH,[Ag(NH_(3))_(2)]^(+)OH^(-)`C. `CH_(3)MgBr,[Ag(NH_(3))_(2)]^(+)OH^(-)//CH_(3)OH`D. `[Ag(NH_(3))_(2)]^(+)OH^(-),CH_(3)MgBr,H^(+)//CH_(3)OH` |
| Answer» Correct Answer - A | |
| 2. |
The major product `H` of the given reaction sequence is `CH_(3) - CH_(2) CO - CH_(3) overset (Theta_(CN)) to G - overset (95% H_(2) SO_(4)) underset (Heat) to H`A. `CH_(3)-CH=underset(CH_(3)) underset(|) C-COOH`B. `CH_(3)-CH=underset(CH_(3)) underset(|) C-CN`C. `CH_(3)-CH_(2)=underset(CH_(3)) underset(|) C-COOH`D. `CH_(3)-CH=underset(CH_(3)) underset(|) C-CO-NH_(2)` |
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Answer» Correct Answer - A |
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| 3. |
The major product `H` of the given reaction sequence is `CH_(3) - CH_(2) CO - CH_(3) overset (Theta_(CN)) to G - overset (95% H_(2) SO_(4)) underset (Heat) to H`A. `CH_(3)-CH=underset(CH_(3))underset("| ")"C"-COOH`B. `CH_(3)-underset(CH_(3))underset("| ")"C"-CN`C. `CH_(3)-CH_(2)-overset(OH)overset("| ")underset(CH_(3))underset("| ")"C "-COOH`D. `CH_(3)-CH=underset(CH_(3))underset("|")C-CONH_(2)` |
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Answer» Correct Answer - B `{:(underset("Butan-2-one")(CH_(3)CH_(2)COCH_(3))overset(bar(C)N)rarr,underset(" Butanone cyanohydrin"(G))(CH_(3)CH_(2)-overset(OH)overset(|)underset(" "CH_(3))underset(|)(C)-CN)):} ` `{:overset(95%H_(2)SO_(4))underset("Dehydration")rarr " "underset(2-"Methyl but-2-en 1-nitrite"(H))(CH_(3)CH=underset(" "CH_(3))underset(|)(C)-CN):}` |
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| 4. |
Identify correct product of the following reaction : A. B. C. D. none of the above |
| Answer» Correct Answer - A | |
| 5. |
The major product (X) formed in the reaction sequence is : A. B. C. `C_(6)H_(5)overset(O)overset(||)C-CH_(3)`D. `C_(6)H_(5)-CO(CH_(3))_(2)` |
| Answer» Correct Answer - C | |
| 6. |
(X) and (Y) are respectively :A. B. C. D. |
| Answer» Correct Answer - D | |
| 7. |
Match the List with List II and select the correct answer from the codes given below the lists : List I (Reaction) (A) `CH_(3)CH=CHCHOrarrCH_(3)CH=CHCOOH` (B) `CH_(3)CH=CHCHOrarrCH_(3)CH=CHCH_(2)OH` (C) `R-COOHrarrR-CH_(2)OH` (D) `CH_(3)CH_(2)COHlrarrCH_(3)CH_(2)CHO` List II (Reagent) (1). `LiAlH_(4)` 2. `NaBH_(4),LiAlH_(4)` 3. Ammoniacal `AgNO_(3)`A. `{:(A,B,C,D),(4,3,2,1):}`B. `{:(A,B,C,D),(1,2,3,4):}`C. `{:(A,B,C,D),(3,1,2,4):}`D. `{:(A,B,C,D),(2,3,1,4):}` |
| Answer» Correct Answer - C | |
| 8. |
Ketones react with Mg-Hg over water givesA. pinacoloneB. pinacolsC. alcoholsD. none of these. |
| Answer» Correct Answer - B | |
| 9. |
Which carbon-racbon bond could not be formed by an aldol condesation reaction? |
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Answer» Correct Answer - (a) |
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| 10. |
Which of the following reactions will not result in the formation of carbon- carbon bond?A. Reimer -Tiemann reactionB. Cannizzaro reactionC. Wurtz-reactionD. Friedel-Crafts acylation |
| Answer» Correct Answer - B | |
| 11. |
A new carbon-carbon bond formation is possible inA. Cannizzaro reactionB. Friedel-Crafts reactionC. Clemmensen reductionD. Reimer-Tiemann reaction. |
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Answer» Correct Answer - B::D A new `C-C`bond is possible only in case of Friedel Crafts reaction and Reimer Tiemann reaction. |
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| 12. |
Which 2-butyne is treated with dil .`H_(2)``SO_(4)`/HgSO`_`(4)`, the product formed isA. buta-1-olB. butan-2-olC. acetone semicarbazoneD. butanone |
| Answer» Correct Answer - D | |
| 13. |
If the enolate ion combines with the carbonyl group of an ester, we getA. enolB. `alpha-beta`-unsaturated esterC. `beta`-ketoaldehydeD. Acid. |
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Answer» Correct Answer - C Infact either `beta`-keto aldehyde or `beta`-diketo can be formed. Since `beta`-diketone is not induced in the option therefore, `beta`- ketoaldehyde is the right option. |
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| 14. |
Acetoacetice ester on hydrolysis by boiling with dil. Yields:A. acetic acidB. acetaldehydeC. propanalD. propanone |
| Answer» Correct Answer - D | |
| 15. |
Base catalysed aldol condensation occurs with:A. BenzaldehydeB. 2-MethylpropionaldehydeD. It gives a positive iodoform test and is a geometrical isomer of X. |
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Answer» Correct Answer - B The compound has an `alpha`-hydrogen atom and can participate in aldol condensation. |
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| 16. |
If a compound gives an organ or red precipitate with 2,4 dinitrophenyl hydraznie, then the compound is :A. an alkyl halideB. ar aryl halideC. an amineD. a carbonyl compound |
| Answer» Correct Answer - D | |
| 17. |
An organic compoun having molecular formula `C_(3)H_(6)O` does not react with 2,4-dintrophenol hydrazine and does not react Na metal. The compound is expected to be:A. `CH_(3)CH_(2)CHO`B. `CH_(2) = CHCH_(2)OH`C. `CH_(3)COCH_(3)`D. `CH_(2) = CH-O-CH_(3)` |
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Answer» Correct Answer - D Only `CH_(2) = CH-O-CH_(3)` will not react with both `2,4` D.N.P. and sodium metal. |
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| 18. |
A compound does not react with 2,4-dinitrophenyl hydrazine, compound is :A. acetoneB. acetaldehydeC. `CH_(3)OH`D. `CH_(3)CH_(2)COCH_(2)` |
| Answer» Correct Answer - C | |
| 19. |
An organic compoun having molecular formula `C_(3)H_(6)O` does not react with 2,4-dintrophenol hydrazine and does not react Na metal. The compound is expected to be:A. `CH_(3)-CH_(2)-CHO`B. `CH_(2)=CH-CH_(2)OH`C. `CH_(3)-CO-CH_(3)`D. `CH_(2)=CH-O-CH_(3)` |
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Answer» Correct Answer - D As the given compound does not react with 2, 4-dinitrophenyl hydrazine it is not an aldehyde or ketone. Further it does not react with metallic sodium it can not be an alcohol. Therefore, the given compound is an ether `(CH_(2)=CH-O-CH_(3))`. |
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| 20. |
Which of the following does not react with phenyl hydrazine?A. EthanolB. EthanalC. AcetoneD. Acetophenone. |
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Answer» Correct Answer - A It is a characteristic reaction of carbonyl group. |
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| 21. |
`(CH_(3)COO)_(2)Ca+(HCOO)_(2)Caoverset("Heat")rarr` |
| Answer» `underset("Cal.acetate")((CH_(3)COO)_(2))Ca+underset("Cal.formate")((HCOO)_(2))Caoverset("Heat")rarrunderset("Acetaldehyde")(2CH_(3)CHO)+CaCO_(3)` | |
| 22. |
Which of the following pairs of reactants is most effective in forming an enamine ?A. `CH_(3)CH_(2)overset(O)overset(||)(CH)+ [(CH_(3))_(2)CH]_(2)NH`B. C. `(CH_(3))_(3)Coverset(O)overset(||)(C)H+ (CH_(3))_(2) NH`D. None of these form an enamine . |
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Answer» Correct Answer - B (c) `2^(@)` amine must be less sterically hindered . |
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| 23. |
Which of the following path ways produces 2-hexanone (i) 1-hexyne is treated with `H_(2)SO_(4), HgSO_(4)` and water (ii) 3-methyl-2-heptene is treated with `O_(3)` followed by hydrolysis (iii) n-butyl magnesium bromide reacts with acetaldehyde followed by hydrolysis and then chromic acid oxidation (iv) hydroboration-oxidation of 1-hexyne.A. `i`, ii and iiiB. `i` and ii onlyC. `i` ii and iv onlyD. `i` and ii only |
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Answer» Correct Answer - A `CH_(3)CHO` is most reactive due to least bin drance and highest electrophilicity of the carndeonyl carbon. |
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| 24. |
In the following sequence of reaction, the end product is : `HC-=CHoverset(Hg^(2+)//H_(2)SO_(4))rarr(A) overset(CH_(3)MgX)underset([H_(2)O])rarr(B)overset([O])rarr(C)`A. acetaldehydeB. isopropyl alcoholC. acetoneD. ethyl alcohol |
| Answer» Correct Answer - C | |
| 25. |
The end product in the following sequence of reaction is `HC equiv CH overset(1%HgSO_(4))underset(20%H_(2)SO_(4)) to A overset (CH_(3) Mg X) to B overset (|0|) to`A. Acetic acidB. Isopropyl alcoholC. AcetoneD. Ethanol. |
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Answer» Correct Answer - C `HC=CHoverset(1%HgSO_(4))underset(20%H_(2)SO_(4))rarrunderset((A))(CH_(3)CHO)overset(CH_(3)MgX)underset(H_(2)O)rarrunderset((B))(CH_(3)CHO)HCH_(3)overset([O])rarrunderset("Acetone")(CH_(3)COCH_(3)` |
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| 26. |
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution givesA. benzyl alcohol and sodium formateB. sodium benzoate and methyl alcoholC. sodium benzoate and sodium formateD. benzyl alcohol and methyl alcohol |
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Answer» Correct Answer - A |
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| 27. |
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution givesA. benzyl alcohol and sodium formateB. sodium benzoate and methyl alcoholC. sodium benzoate and sodium formateD. benzyl alcohol and methyl alcohol. |
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Answer» Correct Answer - A Crossed aldol reaction gives benzyl alcohol and sodium formate. `underset("Benzaldehyde")(C_(6)H_(5)CHO)+underset("Formaldehyde")(HCHO)overset(NaOH(aq))rarrunderset("Benzyl alcohol")(C_(6)H_(5)CH_(2)OH)+underset("Sod. formate")(HCOONa)` |
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| 28. |
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives:A. Benzyl alcohol and sodium formateB. Sodium benzoate and methyl alcoholC. Sodium benzoate and sodium formateD. Benzyl alcohol methyl alcohol |
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Answer» Correct Answer - A Crossed Cannizzaro reaction. `PhCHO+HCHO overset(NaOH)rarr HCOONa+PhCH_(2)OH` |
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| 29. |
The appropriate reagent for the following transfromation: A. Zn(Hg),HCIB. `NH_(2)NH_(2)OH^(-)`C. `H_(2)//Ni`D. `NaBH_(4)` |
| Answer» Correct Answer - B | |
| 30. |
Which will not give formaldehyde on heating or upon distillation ?A. FormalineB. TrioxaneC. ParaldehydeD. Paraformaldehyde |
| Answer» Correct Answer - C | |
| 31. |
Oxidation of acetaldehyde with selenium dioxide produces:A. ethanoic acidB. methanoic acidC. glyoxalD. oxalic acid |
| Answer» Correct Answer - C | |
| 32. |
The reagent used in Gattermann -Koch aldehyde synthesis isA. `Pb//BaSO_(4)`B. Alkaline `KMnO_(4)`C. Acidic `KMnO_(4)`D. `CO+HCI` |
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Answer» Correct Answer - D |
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| 33. |
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on furhter treatment with aqueous KOH yields compound F. Compound F isA. B. C. D. |
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Answer» Correct Answer - A |
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| 34. |
Assertion (A) Formaldehyde is a planar molecule. Reason (R) It contains `sp^(2)` hybridised carbon atom.A. If both (A) and (R) are correct and (R) is the corect explanation of (A)B. If both (A) and (R) are correct but (R) is not correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct |
| Answer» Correct Answer - A | |
| 35. |
A ketone gives a yellow precipitate, when treated with `I_(2)`in an alkaline solution. Thus, the ketone is :A. a cyclic ketoneB. a methyl ketoneC. an unsaturated ketoneD. none of these |
| Answer» Correct Answer - B | |
| 36. |
`C_(6)H_(6)+CO+CHIoverset("Anhyd".AlCl_(3))rarr(X)+CHI` The compound (X) is :A. `C_(6)H_(5)CHO`B. `C_(6)H_(5)COCH`C. `C_(6)H_(5)CH_(2)CHI`D. `C_(6)H_(5)CH_(3)` |
| Answer» Correct Answer - A | |
| 37. |
Hydrogenation of benzoyI chloride in the presence of Pd on `Ba SO_(4)` givesA. benzyl alcoholB. benzaldehydeC. benzoic acidD. phenol |
| Answer» Correct Answer - B | |
| 38. |
Acetophenone when reacted with a base, `C_(2)H_(5)ONa,` yields a stable compound which has the structure :A. B. C. D. |
| Answer» Correct Answer - C | |
| 39. |
In the reaction `CH_(3)CHO + CH_(2)(COOH)_(2) overset("Pyridine")underset("Heat")rarrA` The compound A is :A. `CH_(3)COOH`B. `C_(2)H_(5)COOH`C. `CH_(3)CH=CH-COOH`D. `(COOH)CH=CH-(COOH)` |
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Answer» Correct Answer - C See Knovengeal reaction in Some Noteworthy Points. |
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| 40. |
In the reaction `CH_(3)CHO + CH_(2)(COOH)_(2) overset("Pyridine")underset("Heat")rarrA` The compound A is :A. `CH_(3)COOH`B. `C_(2)H_(5)COOH`C. `CH_(3)CH = CHCOOH`D. `COOHCH = CHCOOH`. |
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Answer» Correct Answer - C `CH_(3)CH=O+H_(2)C(COOH)_(2) overset(-H_(2)O)rarr` `CH_(3)CH=C(COOH)_(2)overset("Heat")underset(-CO_(2))rarrCH_(3)CH=CHCOOH` |
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| 41. |
When vapours of acetic acid are passed over …..`537^(@)` K we get acetone:A. `Al_(2)O_(3)`B. `CuO`C. `MnO`D. `Cu`. |
| Answer» Correct Answer - C | |
| 42. |
A compound A has a molecular formula `C_(2)Cl_(3)OH`, It reduces Fehling solution and on oxidation produces a monocarboxylic acid B. A can also be obtained by the action of `Cl_(2)` on Ethanol. A isA. Chloral hydrateB. `CHCl_(3)`C. `CH_(3)Cl`D. Chloroacetic acid. |
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Answer» Correct Answer - A As it reduces Fehling solution, so it contains aldehyde group. It is chloral `Cl_(3)C-CHO` since it is obtained by the action of `Cl_(2)` on ethanol. |
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| 43. |
Two moles of HCHO and 1 mol of PhCHO react with conc. NaOH. What are the produsts quantitatively? |
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Answer» Initially there will be crossed Cannizzaro reaction between HCHO and PhCHO. `HCHO+PhCHO overset(NaOH)rarr underset(1mol)(HCOONa) + underset(1mol)(PhCH_(2)OH)` `underset((1/2)mol)(HCHO) + underset((1/2)mol)(HCHO) overset(NaOH)rarr underset((1/2)mol)(HCOONa) + underset((1/2)mol)(CH_(3)OH)` Remaining 1 mol of HCHO will give Cannizzaro reaction. So `1//2` mol of HCHO will react with `1//2` mol of HCHO to give `1//2` mol of HCOONa and `1//2` mol of `CH_(3)OH`. Hence, `1.5` mol of HCOONa, 1 mol of `PhCH_(2)OH`, and `1//2` mol of `CH_(3)OH` are formed. |
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| 44. |
Explain: a. Propanol on oxidation with acidic `K_(2)Cr_(2)O_(7)` can give propanal although in poor yield. b. Acid chloride `(RCOCl)` with `R_(2)Cd` and `R_(2)CuLi` gives ketone but with Grignard reagent `(RMgX)` gives `3^(@)` alcohol. c. `R_(2)Cd` or `R_(2)CuLi` reacts with less reactive acid chloride but not with more reactive ketones. |
| Answer» a. If the aldehyde is more volatile than the reactant alcohol and `H_(2)O`, it can be removed from the reaction mixture by fractional distillation as it is formed. Boiling point of propanal is `49^(@)C` and that of propanol is `97^(@)C`. So propanol on oxidation with acidic `K_(2)Cr_(2)O_(7)` first gives propanal. As it is formed, it is removed by distillation (less boiling point, `49^(@)C`) before it is converted to propanoic acid. | |
| 45. |
Which of the following is the major product from sulfonation of `alpha-` tetralone ? A. B. C. D. |
| Answer» Correct Answer - C | |
| 46. |
The major product in the following reaction is : A. B. C. D. |
| Answer» Correct Answer - A | |
| 47. |
The major product in the following reaction is : A. B. C. D. |
| Answer» Correct Answer - A | |
| 48. |
The major product in the following reaction is A. B. C. D. |
| Answer» Correct Answer - D | |
| 49. |
After completion of the reactions `(I` and `II)` , the organic compounds `(s)` in the reaction mixtures is `:` A. Reaction I : P and Reaction II : PB. Reaction I : U, acetone and Reaction II : Q , acetoneC. Reaction I : T, U, acetone and Reaction II : PD. Reaction I : R, acetone and Reaction II : S, acetone |
| Answer» Correct Answer - C | |
| 50. |
Give the structure of 3-Oxopentanal. |
| Answer» `CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(2)-CHO` | |