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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.
| 401. |
Toluene on side chain chlorination and followed by hydrolysis givesA. Tolyl chlorideB. benzaldehydeC. p- chloro tolueneD. acetophenone |
| Answer» Correct Answer - B | |
| 402. |
The esterification of carboxylic acids with alcohols is a kind ofA. electrophilic acyl substituationB. nucleophilic acyl subsitutaionC. electrophilic acyl additionD. nucleophilic acyl addition |
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Answer» Correct Answer - B The esterification of carboxylic acids with alcohols is a kind nuleophilic acyl substituation. |
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| 403. |
Which of the following intermediates are involved in the acid catalyzed esterification of carboxylic acid?A. B. C. D. |
| Answer» Correct Answer - B::C::D | |
| 404. |
Statement-1: Decarboxylation of `beta`- keto acid is very difficult and Statement-2: Decarboxylation takes place via a six membered cyclic transition state.A. Statement-1 is True, Statement-2 is true, statement-2 is a correct explanation for statement-7B. Statement -1 is true, Statement-2 is true, statement-2 is not a correct explanation for statement-7C. Statement-1 is true, statement -2 is FalseD. Statement-1 is False, Statement-2 is true |
| Answer» Correct Answer - D | |
| 405. |
Which of the following esters cannot undergo Claisen self-condensationA. `CH_(3) - CH_(2) - CH_(2) - CH_(2) - COOC_(2)H_(3)`B. `C_(6)H_(5)COOC_(2)H_(5)`C. `C_(6)H_(5)CH_(2)COOC_(2)H_(5)`D. `C_(6)H_(11)CH_(2)COOC_(2)H_(5)` |
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Answer» Correct Answer - B Because it does not have `alpha`-hydrogen atom. |
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| 406. |
Which one of the following would produce an orage coloured precipitate with `2, 4`-dinitrophenyl hydrazine?A. `H_(3)C-overset(O)overset(||)(C)-CH_(3)`B. `CH_(3)CHO`C. D. |
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Answer» Correct Answer - C Conjugated aldchydes and ketone from orange coloured precipitate with2, 4- dinitrophenyl hydrazine. Non - conjugated carbony form yellow precipitate in the same reaction. |
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| 407. |
Correct order of reactivity of `CH_(3) CHO, C_(2) H_(5) COCH_(3) and CH_(3) COCH_(3)` isA. `CH_(3)CHO gt CH_(3)COCH_(3) gt CH_(3)COC_(2)H_(5)`B. `C_(2)H_(5)COCH_(3) gt CH_(3)COCH_(3) gt CH_(3)CHO`C. `CH_(3)COCH_(3) gt CH_(3)CHO gt C_(2)H_(5)COCH_(3)`D. `CH_(3)COCH_(3) gt C_(2)H_(5)COCH_(3) gt CH_(3)CHO` |
| Answer» Correct Answer - A | |
| 408. |
Aldol condensation of acetaldehyde involves the Formation of which of the following intermendiateA. Acetate ionB. A carbanionC. A carbonium ionD. A free redical |
| Answer» Correct Answer - B | |
| 409. |
The acidic strength of active methylene group in I. `CH_(3)COCH_(2)COOH_(2)H_(5)` II.`CH_(3)COCH_(2)COOH_(3)` III. `C_(2)H_(5)OOC CH_(2)COOC_(2)H_(5)`A. `I gt III gt II`B. `I gt II gt III`C. `II gt I gt III`D. `III gt I gt II` |
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Answer» Correct Answer - C Acidic strength in active methylene compounds can be decided by two factors (i) Presence of electron withdrawing group. (ii) Stability of enolate anion obtained after removal of `H^(+)` Hence, `II gt I gt III` |
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| 410. |
Which of the following compound will undergo self - aldol condensation in the presence of cold dilute alkali?A. `C_(6) H_(5) CHO`B. `CH_(3) CH_(2) CHO`C. `CH equiv C - CHO`D. `CH_(2) = CH - CHO` |
| Answer» Correct Answer - B | |
| 411. |
Which of the following gases when passes through warm dilute solution of `H_(2) So_(4)` in presence of `Hg SO_(4)` gives acetaldehyde?A. `CH_(4)`B. `C_(2) H_(6)`C. `C_(2) H_(4)`D. `C_(2) H_(2)` |
| Answer» Correct Answer - D | |
| 412. |
3-hydroxybutanal formed when X reacts whith Y in dilute Z solution. What are X, Y, and Z?A. `X = CH_(3)CHO, Y = (CH_(3))_(2)CO, Z = NaOH`B. `X = CH_(3)CHO, Y = CH_(3)CHO, Z = NaCI`C. `X = (CH_(3))_(2)CO, Y = (CH_(3))_(2)CO, Z = HCI`D. `X = CH_(3)CHO, Y = CH_(3)CHO, Z = NaOH` |
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Answer» Correct Answer - D The product obtained is `CH_(3)-underset(OH)underset(|)(CHCH_(2)CHO` This product is obtained when `2`molecules of `CH_(3)CHO` are heated with concentrated alkali `(NaOH)` `CH_(3)underset(X)(CHO)+underset(Y)(CH_(3))CHOoverset(NaOH)underset(Z)to` `CH_(3)underset(OH)underset(|)CH-CH_(2)-CHO` The aldehydes having `alpha`-hydrogen atom on heating with concentrated alkali give brown mass, aldol condensation. |
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| 413. |
Trichlorroacetaldehyde, `C CI_(3)CHO`. Reacts with chlorobenzene in presence of sulphuric acid and produces.A. B. C. D. |
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Answer» Correct Answer - A It is preparation of DDT. |
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| 414. |
The vapure of a carboxylic acid `HA` when passed over `MnO at 573 K`yields propanone. The acid `HA` isA. Methanoic acidB. Ethanoic acidC. Propanoic acidD. Butanoic acid |
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Answer» Correct Answer - B `2 CH_(3) COOH overset (MnO) underset (573 K) to CH_(3) COCH_(3) + CO_(2) + H_(2) O` |
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| 415. |
An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be :A. Optically active mixtureB. Pure enantiomerC. Meso compoundD. Recemic mixture |
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Answer» Correct Answer - A The poptaically active acid will react with `d and l` forms of alcohol present in the recemic mixture at different rates to form two diastereomers in unequal amount leading to optical activity of the product. |
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| 416. |
When acetadehyde reacts with `PCI_(5)` the resolting compound isA. Ethyl chlorideB. Ethylene chorideC. Ethylidene chlorideD. Trichloro acetaldehyde |
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Answer» Correct Answer - C `CH_(3)-CHO+` |
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| 417. |
In the following reaction order , B is `CH_(3)CH_(2)COOH overset (P//Br_(2)) to A overset (alc KOH) underset (H^(+)) to B`A. `CH_(2)=CH-COOH`B. `CH_(2)-underset(Br)underset(|)(CH)-COOH`C. `CH_(3)CH_(2)COBr`D. `CH_(3)CH_(2)CH_(2)OH` |
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Answer» Correct Answer - A `overset(alc.KOH)underset(H^(+))toCH_(2)=CH-COOH+HBr` `P + Br_(2)` is a brominating agent that brominates the `alpha`-position. The product then undergoes dehydrohalogenation in the presence of alcoholic potassium hydroxide. |
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| 418. |
`R - CH_(2) - CH_(2) OH` can be covered into `RCH_(2) CH_(2) COOH`. The correct sequency of the reagents isA. `PBr_(3), KCN, H_(3) O^(+)`B. `PBr_(3), KCN, H_(2)`C. `HCN, PBr_(3), H^(+)`D. `HCN, H^(+)` |
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Answer» Correct Answer - A `R - CH_(2) CH_(2)OH overset (PHr_(3) to R - CH_(2) CH_(2) - Br` `overset (RCN) to R - CH_(2) - CH_(2) - Cn overset (H_(2)O^(+)) to R - CH_(2) - CH_(2)COONa + CO_(2) + NH_(3)` |
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| 419. |
The reaction`RCH_(2)CH_(2)COOHunderset(Br_(2))overset("RedP")to` `R-CH_(2)-underset(Br)underset(|)(CH)-COOH` is called asA. Reimer-Tiemann reactionB. Hell-Volhard zelinsky reactionC. Cannizare reactionD. Sandmeyer reaction |
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Answer» Correct Answer - B Hell-Volhard Zelinsky reaction |
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| 420. |
Arrange the following compounds in an increasing order of their reactivity in nucleophilic addition reactions : Ethanal, Propanal, Propanone, Butanone. |
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Answer» Butanone < propanone < propanal < ethanal. |
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| 421. |
Carboxylic acid donot give characteristic property ofA. R - groupB. `- COOH `groupC. `gt C = O` groupD. `- O - H` group |
| Answer» Correct Answer - C | |
| 422. |
Give simple chemical tests to distinguish between the following pair of compounds : Propanal and Propanone |
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Answer» Propanal and propanone can be distinguished by their reactions with Tollens’ reagent. Propanal will form the silver mirror, but propanone does not react. |
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| 423. |
Give chemical tests to distinguish between :(i) Propanal and propanone (ii) Benzaldehyde and acetophenone |
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Answer» (i) Propanal and propanone :- Propanal and propanone can be distinguished by their reactions with Tollens’ reagent. Propanal will form the silver mirror, but propanone does not react. (ii) Benzaldehyde and acetophenone :- Benzaldehyde and acetophenone can be distinguished by Tollens’ test. Benzaldehyde will form silver mirror, on treatment with Tollens’ reagent whereas acetophenone will not show Tollens’ Test. |
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| 424. |
Give simple chemical tests to distinguish between the following pairs of compounds :(i) Benzaldehyde and benzoic acid(ii) Propanal and propanone. |
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Answer» (i) Benzaldehyde and benzoic acid can be distinguished by sodium bicarbonate test. Benzoic acid will give effervescence with NaHCO3 but benzaldehyde will not react. (ii) Propanal and propanone can be distinguished by their reactions with Tollens’ reagent. Propanal will form the silver mirror, but propanone does not react. |
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| 425. |
Acetone gives addition elimination reaction with (1)`NH_(2) - OH " "(2) NH_(2) - CONH - NH_(2)` (3) `NaHSO_(3)" "(4) CH_(3) - NH_(2)`A. `2,4`B. `3,4`C. `1,2,4`D. `1,2,3` |
| Answer» Correct Answer - C | |
| 426. |
Which of the following is not an organic acidA. Carbonic acidB. Citric acidC. Ethanoic aicdD. Formic acid |
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Answer» Correct Answer - A |
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| 427. |
The correct order of electronegativity isA. `F gt Cl gt Br gt I`B. `Li gt K gt Br gt I`C. `I gt Br gt Cl gt F`D. None |
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Answer» Correct Answer - A |
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| 428. |
In the following reaction the product E is `underset(CHO)underset(|)(CHO)underset((ii)H^(+))overset((i)NaOH)toE`A. `underset(CHO)underset(|)(CH_(2)OH`B. `underset(CO_(2)H)underset(|)(CHO)`C. `underset(CO_(2)H)underset(|)(CH_(2)OH)`D. `underset(CO_(2)H)underset(|)(CO_(2)H)` |
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Answer» Correct Answer - C `underset(CHO) overset(CHO)|overset((i)NaOH)to underset(("Oxidised part"))underset(COONa) overset(("Reduced Part")) underset(CH_(2)OH)| overset((ii) H^(+)) to underset(CO_(2)H) overset(CH_(2)OH)|` |
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| 429. |
`overset(" CHO")underset(" CHO")("|")overset(NaOH)toX` The product (X) will beA. `overset(" CH"_(2)ONa)underset(" COONa")("|")`B. `overset(" COOH")underset(" COOH")("|")`C. `overset(" CH"_(2)OH)underset(" COONa")("|")`D. `overset(" CH"_(2)OH)underset(" CH"_(2)OH)("|")` |
| Answer» Correct Answer - C | |
| 430. |
Which of the following pathways produces 2- pentanone (1) pent-1- yne is treated with `H_(2) SO_(4) + HgSO_(4) ` and water (2) 3- methylhex -2- ene is treated with `O_(3)` followed by hydrolysis (3) n - butyl megnesium halide is reacted with formaldehyde (4) hydroboration oxidation of pent -1- eneA. `1,3`B. `1,2`C. `2,4`D. `1,3,4` |
| Answer» Correct Answer - B | |
| 431. |
Calcium formate, on dry heating, producesA. acetoneB. acetic acidC. acetaldehydeD. formaldehyde |
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Answer» Correct Answer - D We know that `(HCOO)_(2)Ca overset(Delta) toHCHO + CaCO_(3)`. Thus in this reaction, formaldehyde (HCHO) is produced. |
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| 432. |
Formaldehyde when treated with KOH (caustic potash) gives methanol and potassium formate, the reaction is known asA. Perkin reactionB. Claisen reactionC. Cannizzaro reactionD. Knoevengael reaction |
| Answer» Correct Answer - C | |
| 433. |
Acetic anhydride is obtained by the reaction ofA. sodium and acetic acidB. ammonia and acetic acidC. ethanol and acetic acidD. `P_(2)O_(5)` and acetic acid . |
| Answer» Correct Answer - D | |
| 434. |
Hydrolysis of ethanoic anhydride givesA. methanoic acidB. propanoic acidC. ethanoic acidD. oxalic acid |
| Answer» Correct Answer - C | |
| 435. |
When formaldehyde react with ethyl amine , it givesA. formaldehyde imineB. formaldehyde imineC. dimethyl amineD. diethylmaine |
| Answer» Correct Answer - B | |
| 436. |
The correct order of increasing strength of compounds (1) `CH_(3) COOH " "(2) NO_(2)CH_(2)COOH` (3) ` CF_(3) COOH" "(4) C_(2)H_(5) - COOH`A. `4 gt 3 gt 2 gt 1`B. ` 3 gt 2 gt 1 gt 4`C. ` 3 gt 1 gt 2 gt 4`D. ` 3 gt 4 gt 2 gt 1` |
| Answer» Correct Answer - B | |
| 437. |
Oxidation of toluene by chromium oxide in acetic anhydride givesA. benzaldehydeB. benzoic acidC. benzophenoneD. acetophenone |
| Answer» Correct Answer - A | |
| 438. |
In Clemmensen reduction carbonyl compound is treated with ________.A. zinc amalgam + HClB. sodium amalgam + HClC. zinc amalgam + nitric acidD. sodium amalgam + `HNO_(3)` |
| Answer» Correct Answer - A | |
| 439. |
Which of the following compound gives a ketone with Grignard reagent ?A. FormaldehydeB. Ethyl alcoholC. Methyl cyanideD. Methyl iodide |
| Answer» Correct Answer - C | |
| 440. |
Butanone and butanal areA. chain isomersB. position isomersC. functional isomersD. tautomers |
| Answer» Correct Answer - C | |
| 441. |
Formaldehyde + ammonia ` to ` Y , the product Y isA. methanolB. formamideC. para-formaldehydeD. hexamethylene tetraamine |
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Answer» Correct Answer - D We know that , `6HCH = O + 4NH_(3) to (CH_(2))_(6) N_(4) + 6H_(2) O`. Formaldehyde Hexamethylene tetramine Thus in this reaction , the product Y is hexamethylene tetramine `[(CH_(2))_(6)N_(4)]` |
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| 442. |
IUPAC name of following compound is `(CH_(3))_(3) C - CH_(2) - COOH`A. 2,2-dimethylbutanoic acidB. 3,3-dimethylbutanoic acidC. 2, 3- dimethylpropanoic acidD. 2, 3- dimethylbutanoic acid |
| Answer» Correct Answer - B | |
| 443. |
Assertion : Etard reaction helps to stop the oxidation of toluene at the aldehyde stage. Reason : Chromyl chloride oxidises methyl group to a chromium complex, which on hydrolysis gives corresponding benzaldehyde.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
| Answer» Correct Answer - A | |
| 444. |
A liquid was mixed with ethanol and a drop of concentrated `H_(2) SO_(4)` was added. A compound with a fruity smell was formed. The liquid wasA. `CH_(3)OH`B. HCHOC. `CH_(3)COCH_(3)`D. `CH_(3)COOH` |
| Answer» Correct Answer - D | |
| 445. |
Molecular formula `C_(4)H_(8)O_(2)` on acid hydrolysis gives acetic acid and ethanol. The structures of `C_(4)H_(8)O_(2)` will beA. B. C. D. |
| Answer» Correct Answer - B | |
| 446. |
When a ketone is condensed into an ketol, the reagent used isA. `Na_(2)CO_(3)`B. `NaHCO_(3)`C. `Br_(2) ` waterD. `Cl_(2)` |
| Answer» Correct Answer - A | |
| 447. |
Which of the following does not used to convert ketone to secondary alcohol ?A. `LiAlH_(4)`B. `NaBH_(4)`C. `H_(2)//Pd-BaSO_(4)`D. `Na+C_(2)H_(5)OH` |
| Answer» Correct Answer - C | |
| 448. |
Carbonyl group in aromatic aldehyde and ketone isA. o-directingB. p-directingC. o-and p- directingD. m - directing |
| Answer» Correct Answer - D | |
| 449. |
Formation of acetaldehyde from ethanol is known asA. oxidationB. substitutionC. additionD. reduction |
| Answer» Correct Answer - A | |
| 450. |
Out of (1) butane (2) butan -1- ol (3) butanal (4) butanone . The decreasing order of their B.P isA. `1 gt 2 gt 3 gt 4`B. ` 2 gt 4 gt 4 gt 1`C. ` 2 gt 3 gt 4 gt 1`D. ` 4 gt 2 gt 3 gt 1` |
| Answer» Correct Answer - C | |