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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. |
Which of the following reactions may give benzalydehyde?A. B. C. D. |
| Answer» Correct Answer - A::B::C::D | |
| 52. |
Which of the following reactions is not correct ?A. `CH_(3)-CHOoverset(SeO_(2))rarrCHO-CHO-("glyoxal")`B. C. D. `CH_(3)-COOHoverset(SeO_(2))rarroverset(COOH)underset(COOH)(|)` |
| Answer» Correct Answer - D | |
| 53. |
Which gives nucleophilic addition reactions ?A. MethanalB. EthanalC. PropanoneD. None of these |
| Answer» Correct Answer - A::B::C | |
| 54. |
In the reactions : A. A is an aldehyde , B is ketone and C is an alkeneB. A,B and C are alkenesC. A,B, and C are alkanesD. A and B are alkenes while C is an alkane |
| Answer» Correct Answer - C | |
| 55. |
`CH_(3)CHO+H_(2)NHOrarrCH_(3)-CH=N-OH` The above reaction occurs atA. pH = 1B. pH = 3.5C. Any value of pHD. pH = 12. |
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Answer» Correct Answer - B Aldehydes/ketones reacts with ammonia derivative like (hydrazine, `NH_(2)NH_(2)`, hydroxyl amine, `NH_(2)OH` etc.) under slighty acidic conditions (pH = 4.5) |
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| 56. |
In the reaction `CH_(3)CHO+HCNtoCH_(3)CH(OH)CN` a chiral centre is produced. This product would beA. meso compoundB. laevorotatoryC. dextrorotatoryD. racemic mixture |
| Answer» Correct Answer - D | |
| 57. |
The conversation : `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)underset(H_(2)SO_(4))overset("dil")rarrCH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-underset(O)underset(||)(C)-CH_(3)` is called :A. Beckmann rearrangement.B. Pinacol-Pinacolone rearrangementC. Claisen rearrangementD. Fries rerragement. |
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Answer» Correct Answer - B Is the correct answer. |
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| 58. |
Consider two aldehydes containing `alpha`-hydrogenes, (I) `CH_(3)CH_(2)CHO` (II) `H_(2)C=CH-CHO` The correct statement (s) is/are:A. both undergo aldol condensationB. both do no undergo aldol condensationC. only aldehyde (I) undergoes aldol condensationD. only aldehyde (II) undergoes aldol condensation |
| Answer» Correct Answer - C | |
| 59. |
The reaction `C_(6) H_(5) CHO + CH_(3) CHO rarr C_(6) H_(5) CH = CH - CHO` is known asA. Cannizzaro reactionB. Aldol condensationC. Claisen-Schmidt condensationD. Benzoin condensation |
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Answer» Correct Answer - C Claisen-Schmidt condensation or claisen reaction. |
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| 60. |
Complete the following reaction with appropriate structure. `C_(6)H_(5)-CHO+CH_(3)-COOC_(2)H_(5)overset(NaOC_(2)H_(5)"in absolute")underset(C_(2)H_(5)OH "and heat")rarr` (A) |
| Answer» `underset("Benzaldehyde")(C_(6)H_(5)CH)=O+underset("Ethyl acetate")(CH_(3)COOC_(2)H_(5))underset("In"C_(2)H_(5)OH)overset(C_(2)H_(5)ONa)rarrunderset("Ethyl cinnamate")(C_(6)H_(5)CH=CHCOOC_(2)H_(5))+H_(2)O` | |
| 61. |
Which can be oxidized to the corresponding carbonyl compound?A. 2-hydroxy propaneB. Ortho-nitro phenolC. PhenolD. 2-methyl-2-hydroxy propane |
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Answer» Correct Answer - A 2-hydroxy propane or secondary alco0hol is oxidised into propanone (corresponding becaue in 2-hydroxy propane, secondary alcoholic group is present and it is oxidised into ketone). `underset("2-hydroxy propane")(2^(@)" alcohol")(CH_(3)-underset(OH)underset(|)(C)H-CH_(3))overset([O])tounderset("Propanone")("Ketone")(CH_(3)-underset(O)underset(||)(C)-CH_(3))` |
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| 62. |
Assertion: Isobutanal does not give iodoform test. Reason : It does not have `alpha`-hydrogen.A. Both A and R are ture and R is the correct explanation of A.B. Both A and R are ture but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true |
| Answer» Correct Answer - C | |
| 63. |
A band smelling yellow insoluble resin in obtained by boiling NaOH solution with :A. HCHOB. `CH_(3)CHO`C. `CH_(3)COCH_(3)`D. `C_(2)H_(5)COCH_(3)` |
| Answer» Correct Answer - B | |
| 64. |
Assertion: Isobutanal does not give iodoform test. Reason : It does not have `alpha`-hydrogen.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct and reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion as well as reason are both incorrect. |
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Answer» Correct Answer - C Correct reason. Isobutanal does not have a methylketonic group `(CH_(3)CO)` which is essential for the iodoform test. |
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| 65. |
A carbonyl group can be converte into`-CH_(2)` group by:A. `H_(2)//Ni`B. `LiAlH_(4)`C. `Zn-Hg//conc.HCI`D. `NH_(2NH_(2)//HCI` |
| Answer» Correct Answer - C | |
| 66. |
Assertion: Hydroxyketones are not directly used in Grignard reaction. Reason : Griganard reagnts react with hydroxyl group.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct and reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion as well as reason are both incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 67. |
Which of the followingg compounds give a kentoen with Griganard reagent ?A. HCHOB. `CH_(3)CH_(2)OH`C. `CH_(3)CN`D. `CH_(3)I` |
| Answer» Correct Answer - C | |
| 68. |
Among the following, the least reactive aldehyde isA. HCHOB. `C_(6)H_(5)CHO`C. `CH_(3)CHO`D. `C_(2)H_(5)CHO`. |
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Answer» Correct Answer - B `C_(6)H_(5)CHO` |
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| 69. |
The calcium salt of which the following acid on dry distillation gives 2, 4-dimethylpentan-3-one?A. Propionic acidB. Isobutyric acidC. Butyric acidD. Adipic acid. |
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Answer» Correct Answer - B `2[(CH_(3))_(2)CHCOO]_(2)Caoverset("Dry distil")rarr(CH_(3))_(2)CH-overset(O)overset(||)C-CH(CH_(3))_(2)+CaCO_(3)` |
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| 70. |
The final product (Y) formed in the reaction A. B. C. D. |
| Answer» Correct Answer - C | |
| 71. |
The final product of the following reaction is A. B. C. D. |
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Answer» Correct Answer - C `C_(6)H_(5)CHO+Cl_(2)overset("443 K")rarrC_(6)H_(5)COCl+HCl` |
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| 72. |
Consider the following statement acetophenone can be prepared by (1) Oxidation of 1-phenylethanol (2) Reaction of banzylalcohol with methyl magnesium bromide (3) Friedel-Crafts reaction of benzene with acetyl chloride (4) Distillation of calcium benzoateA. I and IIB. I and IVC. I and IIID. III and IV. |
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Answer» Correct Answer - C `underset("1-Phenylethanol")(C_(6)H_(5)CHOHCH_(3))overset([O])rarrunderset("Acetophenone ")(C_(6)H_(5)COCH_(3))` `C_(6)H_(6)+CH_(3)COCloverset("F & C")underset("reaction")rarrC_(6)H_(5)COCH_(3)+HCl` |
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| 73. |
Which of the following gives aldol condensation reaction?A. `C_(6)H_(5)OH`B. `C_(6)H_(5)-overset(O)overset(||)C-C_(6)H_(5)`C. `CH_(3)CH_(2)-overset(O)overset(||)C-CH_(3)`D. `(CH_(3))_(3)C-overset(O)overset(||)C-H` |
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Answer» Correct Answer - C Although both `CH_(3)CH_(2)COCH_(3)` and `(CH_(3))_(3)"CCOCH"_(3)` contain `alpha`-hydrogen, yet `(CH_(3))_(3)"CCOCH"_(3)` does not undergo Aldol condensation due to steric hendrance. |
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| 74. |
Ketones are less reactive than aldehydes in the nuclephilic addition reactions. Justify . |
| Answer» This is attributed to the greater steric hindrance by the alkyl (or aryl) groups in ketones compared to one such group in aldehydes t the attacking nucleophile. Moreover, these groups also tend to increase the electron desnsity on the carbonyl carbon atom more in ketones in comparison to aldehydes. Ketones are therefore, less reactive than aldehydes in the nuclophilic addition reactions. | |
| 75. |
Why does not formaldehyde take part in aldol condensation? |
| Answer» Aldol condensation involvses the nucleophile attrack to carbanion generated by one molecular of a particular carbonyl `3*5`). In case the medium is srongly acidic (`p_(H)` close to `1`). then the ammonia derivates will be also protonated and will not be able to act as a nucleophile. | |
| 76. |
Cannizzaro reaction is not given byA. methanalB. phenyl methanalC. 2, 2-dimethylbutanalD. phenyl ethanal. |
| Answer» Correct Answer - B | |
| 77. |
Which of the following on treatment with aqueus sodium hydroxide will give corresponding alcohol and acid?A. `C_(6)H_(5)CH_(2)CHO`B. `C_(6)H_(5)CHO`C. `CH_(3)CH_(2)CH_(2)CHO`D. `CH-overset(O)overset(|)(C)-CH_(3)` |
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Answer» Correct Answer - B Aldehydes which do not have any `alpha`-hydrogen atom when heated with a concentrated solution of NaOH undergo a simultaneous oxidation and reduction (disproportionation) forming a salt of carboxylic acid and alcohol. This reactio is called cannizaro reaction `2C_(6)H_(5)CHO+naOHtounderset("Benzyl alcohol")(C_(6)H_(5)CH_(2)OH)+underset("Sodium benzoate")(C_(6)H_(5)CO overset(-)(O)overset(+)(Na)` |
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| 78. |
Aldol condensation will not take place inA. `HCHO`B. `CH_(3)CHO`C. `CH_(3)COCH_(3)`D. `CH_(3)CH_(2)CHO` |
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Answer» Correct Answer - A Aldol condensation in aldehydes is due to presence of `alpha`-hydrogn atoms. Those aldehydes which does not have `alpha`-hydrogen atom like `HCHO` does not givel aldol condensation reaction. |
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| 79. |
Nucleophilic addition reaction will be most favoured inA. `CH_(3)CHO`B. `CH_(3)CH_(2)-COCH_(3)`C. `(CH_(3))_(2)C=O`D. `CH_(3)CH_(2)CHO`. |
| Answer» Correct Answer - A | |
| 80. |
`CH_(3)CH_(2)-=Noverset(X)rarrCH_(3)CH_(2)CHO` the compound X is :A. `H_(2)//Pd-BaSO_(4)`B. `SnCI_(2)//HCI//H_(2)O`, boilC. `LiAIH_(4)//` etherD. `NaBH_(4)//"ether"//H_(3)O^(+)` |
| Answer» Correct Answer - B | |
| 81. |
Reduction of aldehydes and ketones into hydrocarbons using hydrazine and sodium ethoxide is called :A. Clemmensen reductionB. Cope reductionC. Dow reductionD. Wolff-Kishner reduction |
| Answer» Correct Answer - D | |
| 82. |
In the presence of aluminimum ethoxide aldehydes are converted into esters. The reaction is calledA. Schmidt reactionB. Aldol condensationC. Beckmann rearragementD. Tischenko reaction. |
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Answer» Correct Answer - D `underset("Aldehyde")(2RCH_(2)CHO)overset(Al(OC_(2)H_(5))_(3))rarrunderset("Ester")(RCH_(2)COOCH_(2)CH_(2)R)` |
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| 83. |
The general formula of `C_(n)H_(2n)O_(2)` could be for open chainA. diketonesB. carboxylic acidsC. diolsD. Dialdehydes. |
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Answer» Correct Answer - B Carboxylic acid is represented by the general formula `C_(n)H_(2n)O_(2)`. e.g. Acetic acid `(C_(2)H_(4)O_(2))`. |
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| 84. |
In the reaction , the acid obtained will be : `CH_(3)CHO + HCN to CH_(3)CH(OH)Cnoverset(H-OH)(to) CH_(3)CH(OH)COOH`A. D-isomerB. L-isomerC. `(80% D + 20%L)` mixtureD. (50%D + 50%L) mixture |
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Answer» Correct Answer - D (d) Attact at `sp^(2)` carbon take place on above and below the plane of `sp^(2)` carbon . |
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| 85. |
Which of the following does not react with `NaHSO_(3)?`A. `CH_(3)COCH_(3)`B. `CH_(3)CHO`C. HCHOD. None of these |
| Answer» Correct Answer - D | |
| 86. |
Benzophenone does not react with `NaHSO_(3)`. Explain. |
| Answer» The addition of `NaHSO_(3)` on benzophenone `[(C_(6)H_(5))_(2)C = O]` involves the nucleophile attack of bisulphite `(HSO_(3^(-)))` ion. The phenyl groups act as hindrance ot the attacking nucleophile. Therefore, benzophenone does not react with `NaHSO_(3)`. | |
| 87. |
Which of following does not react with `NaHSO_(3)` (sodium bisulphite)?A. `CH_(3)-overset(O)overset(||)(C)-H`B. `CH_(3)-overset(O)overset(||)(C)-Et`C. `Et-overset(O)overset(||)(C)-Et`D. `Ph-CH_(2)-overset(O)overset(||)(C)-CH_(3)` |
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Answer» Correct Answer - C (c) `NaHSO_(3)` will react with aldehyde and methyl ketone only . |
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| 88. |
Which fo the following compounds does not react with `NaHSO_(3)` ?A. `C_(6)H_(5)CHO`B. AcetophenoneC. AcetoneD. Acetaldehyde. |
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Answer» Correct Answer - C In general, ketones are less reactive than aldehydes and further, aromatic ketones are even less reactive than aliphatic ketones. |
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| 89. |
What reagent and /or reaction conditions would you choose to bring about the following conversion ? A. `1. LiAlH_(4) , 2. H_(2)O`B. `H_(2)O , H_(2)SO_(4)` , heatC. `H_(2)O , NaOH` , heatD. `PCC , CH_(2)Cl_(2)` |
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Answer» Correct Answer - B (b) Hydrolysis of hemiacetal take place in acidic medium. |
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| 90. |
IUPAC name of crotonaldehyde isA. ButanalB. But-2-enalC. But-1-enalD. None of these. |
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Answer» Correct Answer - B `CH_(3)CH=CHCHO` is But-2-enal |
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| 91. |
The IUPAC name of crotonaldehyde isA. ButanalB. But-2-enalC. But-1-eanlD. None of these. |
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Answer» Correct Answer - B `underset("But-2-enal")underset("Crotonaldehyde")(H_(3)overset(4)C-overset(3)CH=overset2CH-overset(1)CHO` |
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| 92. |
Treatment of `PhCH_(2)CH_(2)COCl` with `H_(2)` in presence of Pb - `BaSO_(4)` givesA. `Ph-CH_(2)CH_(2)CHO`B. `PhCH_(2)CH_(2)OH`C. both (A) and (B)D. none of the above. |
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Answer» Correct Answer - A `PhCH_(2)CH_(2)COCl+H_(2)overset("Pd-BaSO"_(4))rarrunderset("2 Phenyl ethan-1-ol")(Phoverset(2)CH_(2)overset(1)CH_(2)-OH)` |
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| 93. |
Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the intermediate formation of:A. carbocationB. carbanionC. free radicalD. carbene |
| Answer» Correct Answer - D | |
| 94. |
When phenyl cyanide is reduced with `SnCl_(2)` and HCl in ethereal solution and the products is hydrolysed it, gives :A. benzaldehydeB. benzoic acidC. banzamideD. aniline |
| Answer» Correct Answer - A | |
| 95. |
Acetone on heating with conc. `H_(2)SO_(4)` gives :A. MesityleneB. Mesityl oxideC. PhoroneD. Xylene. |
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Answer» Correct Answer - A Three molecules condense to form mesitylene `underset(O)underset(||)("trimethyl benzene")` |
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| 96. |
The general molecular formula of aldehydes and ketones is :A. `C_(n)H_(2n+2)O`B. `C_(n)H_(2n)O_(2)`C. `C_(n)H_(2n)O`D. `C_(n)H_(2n+1)O`. |
| Answer» Correct Answer - C | |
| 97. |
Bensaldehyde on Clemmensen reduction forms :A. tolueneB. phenyl methaneC. methyl lbenzeneD. all of these |
| Answer» Correct Answer - D | |
| 98. |
Acetone on heating with conc. `H_(2)SO_(4)` gives :A. phoroneB. acroleinC. MesityleneD. mesityl oxide. |
| Answer» Correct Answer - C | |
| 99. |
Ethyl methyl ketone on treatement with a solution of sodium hypochlorite gives chloroform andA. sodium methanoateB. sodium ethanoateC. sodium propanoateD. sodium ethoxide |
| Answer» Correct Answer - C | |
| 100. |
(A) p-methoxy benzaldehyde is less recative than bensaldehyde towards cyanohydrin formation. (R) The +R effect methoxy group increases the electron deficiency of the carbonyl carbon.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 - C | |