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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.
| 351. |
Among ethanol (I), acetic acid (II), phenol (III) and benzoic acid (IV), the correct order of increasing acid strength isA. `I lt II lt III lt IV`B. `I lt III lt II lt IV`C. `I lt III lt IV lt II`D. `III lt IV lt I lt II` |
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Answer» Correct Answer - B Benzoic acid is stronger than acetic acid due to `-I` effect of `-C_(6)H_(5)` group. Acetic acid is stronger acid than phenol which is stronger acid than ethanol |
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| 352. |
Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore X and Y are respectivelyA. Sodalime and copperB. Zinc dust and sodium hydroxideC. Zinc dust and sodalimeD. Sodalime and zinc dust |
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Answer» Correct Answer - D Sodalime and zinc dust |
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| 353. |
Phenol and benzoic acid may be distinguished by their reaction withA. Aqueous `NaOH`B. Aueous `NaHCO_(3)`C. Neutral `FeCl_(3)`D. Aqueous `NH_(3)` |
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Answer» Correct Answer - B::C (B) Benzoic acid gives brisk efferescence `(CO_(2))` with aqueous sod. Bicarbonate while phenol does not. (C) Phenol gives characteristic colout (violet) with neutral aqueous `FeCl_(3)` while benzoic acid gives buff coloured precipitates |
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| 354. |
Benzoyl chloride on treatment with ammonia givesA. BenzamideB. AcetamideC. BenzylamineD. Benzoic acid |
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Answer» Correct Answer - A `C_(6)H_(5)COCl + 2NH_(3) rarr underset("Benzamide")(C_(6)H_(5)CONH_(2) + NH_(4)Cl` |
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| 355. |
Which atom of H is replaced by `Br_(2)` in presence of P from an acid :A. `alpha`B. `gamma`C. `beta`D. `delta` |
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Answer» Correct Answer - A See properties of acids |
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| 356. |
Which of the following is the weakest acid ?A. B. `CH_(3)COOH`C. `HCOOH`D. |
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Answer» Correct Answer - A Phenol is a weaker acid than carboxylic acids |
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| 357. |
Which is the correct order of acidity from weakest to strongest acid for these compounds : A. ` I lt IV lt III lt II `B. ` IV lt I lt III lt II `C. `IIIltIV lt I lt II`D. `IIltIIIltIltIV` |
| Answer» Correct Answer - B | |
| 358. |
An ester is boiling with `KOH`. The product is cooled and acidified with conc. HCl. A white crystalline acid separates. The ester isA. Methyl acetateB. Ethyl acetateC. Ethyl formateD. Ethyl bexzoate |
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Answer» Correct Answer - D `ArCOOR + H_(2)O overset(KOH)rarr ArCOOK + ROH` `ArCOOK + HCl rarr ArCOOH + KCl` Aromatic acids are insoluble in cold water. |
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| 359. |
The group present in waxes areA. acid groupB. ester groupC. alcohol groupD. ether group |
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Answer» Correct Answer - B Refer to comprehensive review |
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| 360. |
Tamarind containsA. dextro--tartaric acidB. laevo-tartaric acidC. `(+-)-` Tartaric acidD. citric acid |
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Answer» Correct Answer - A `(+)-` Tartaric acid |
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| 361. |
Which of the following acids is present in vinegar?A. Formic acidB. Acetic acidC. Tartaric acidD. Butyric acid |
| Answer» Correct Answer - B | |
| 362. |
Tamarind contains:A. tartaric acidB. lactic acidC. citric acidD. succinic acid |
| Answer» Correct Answer - A | |
| 363. |
Vinegar obtained from sugarcane hasA. `CH_(3)COOH`B. `HCOOH`C. `C_(6)H_(5)COOH`D. `CH_(3)CH_(2)COOH` |
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Answer» Correct Answer - A Refer to comprehensive review |
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| 364. |
Relative acidity of the following is in the order :A. `RCOOHgt H_(2)CO_(3) gt C_(6)H_(5)OHgt H_(2)Ogt ROH`B. `RCOOHgt ROHgt H_(2)CO_(3) gt C_(6)H_(5)OHgt H_(2)O`C. `RCOOHgt C_(6)H_(5)OHgt ROH gt H_(2)CO_(3) gt H_(2)O`D. `ROH gt RCOOHgt H_(2)CO_(3) gt C_(6)H_(5)OHgt H_(2)O` |
| Answer» Correct Answer - A | |
| 365. |
Which of the following compounds does not react with NaOH?A. `CH_(3)COOH`B. `CH_(3)CONH_(2)`C. `C_(6)H_(5)OH`D. `CH_(3)CH_(2)OH` |
| Answer» Correct Answer - D | |
| 366. |
Lactic acid is:A. propionic acidB. `alpha`-hydroxypropionic acidC. `beta`-hydroxypropionic acidD. none of the above |
| Answer» Correct Answer - B | |
| 367. |
Chlorination of toluene in presence of light and heat followed by treatment with aqueous `NaOH` givesA. `o-`CresolB. `p-`CresolC. Mixture of `o-`cresol and `p-`cresolD. Benzoic acid |
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Answer» Correct Answer - D `C_(6)H_(5)-CH_(3)underset(-3HCl)overset(3Cl_(2), hv//Delta)rarr C_(6)H_(5)C Cl_(3) overset(aq.NAoH)rarrC_(6)H_(5)COONa overset(H^(+))rarrC_(6)H_(5)COOH` |
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| 368. |
The d (+)lactic acid is obtained from:A. fermentation of cane sugarB. green vegetablesC. musclesD. fermentation of milk sugar |
| Answer» Correct Answer - C | |
| 369. |
Pyroligneous acid containsA. 2% acetic acidB. 50% acetic acidC. 10% acetic acidD. 20% acetic acid |
| Answer» Correct Answer - C | |
| 370. |
Lactic acid on heating with dill. `H_(2)SO_(4)` givesA. Acetic acidB. Propionic acidC. Acrylic acidD. Formic acid |
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Answer» Correct Answer - D `CH_(3) - overset(OH)overset(|)(CH) - COOH overset(H^(+))rarr HCOOH + CH_(3) CHO` |
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| 371. |
When sodium formate is heated at 633K, main product is:A. sodium oxalate and `H_(2)`B. oxalic acid and `H_(2)`C. sodium oxalateD. `CO_(2)` and caustic soda |
| Answer» Correct Answer - A | |
| 372. |
When sodium formate is heated with soda lime, it forms:A. `H_(2)`B. COC. `CO_(2)`D. water vapour |
| Answer» Correct Answer - A | |
| 373. |
X is heated with soda lime and gives ethane. X isA. ethanoic acidB. methanoic acidC. propanoic acidD. Either (A) or (C) |
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Answer» Correct Answer - C `underset((X))(CH_(3)CH_(2)COONa) + NaOH underset(Delta)overset(CaO)rarr CH_(3) - CH_(3) + Na_(2)CO_(3)`. |
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| 374. |
The refluxing of `(CH_(3))_(2) NCOCH_(3)` with acid givesA. `2CH_(3)NH_(2)+ CH_(3)COOH`B. `2CH_(3)OH + CH_(3)CONH_(2)`C. `(CH_(3))_(2) NH + CH_(3)COOH`D. `(CH_(3))_(2)NCOOH + CH_(4)` |
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Answer» Correct Answer - C Refer to hydrolysis of acyl derivatives |
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| 375. |
A colourless liquid, at room temperature reacts with soda lime to form sodium salt of carboxylic acid and ammonia gas. The liquid isA. PropanamideB. Propanoic acidC. FormamideD. Methyl Ethanoate |
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Answer» Correct Answer - C Since in the reaction sodium salt of fatty acid is formed it must be an acid or some acid derivative. Further since `NH_(3)` gas is alos evolved hence it must be an amide. Moreover, at room while all other amides are colourless crystalline solids |
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| 376. |
Pinacolone isA. 2, 3-Dimethyl, 2, 3-butanediolB. 3, 3-Dimethyl-2-butanoneC. 1, Phenyl-2-propanoneD. None of these |
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Answer» Correct Answer - B `underset("Benzil")(C_(6)H_(5) - overset(O)overset(||)(C) - overset(O)overset(||)(C) - C_(6)H_(5)) overset(OH^(-))rarr underset("Benzillic acid")(C_(6)H_(5) - underset(C_(6)H_(5))underset(|)overset(OH)overset(|)(C) - COOH)` |
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| 377. |
Which of the following compounds is resistant to nucleophilic attack by hydroxyl ion ?A. MethylacetateB. AcetonitrileC. AcetamideD. Diethylether |
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Answer» Correct Answer - D Acid derivatives are attacked readily by nucleophiles while ether are not |
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| 378. |
Consider the acidity of the carboxylic acids : (a) `PhCOOH` (b) `o-NO_(2)C_(6)H_(4)COOH` (c) `p-NO_(2)C_(6)H_(4)COOH` (d) `m-NO_(2)C_(6)H_(4)COOH` Which of the following order is correct ?A. `a gt b gt c gt d`B. `b gt c gt d gt a`C. `b gt d gt a gt c`D. `b gt d gt c gt a` |
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Answer» Correct Answer - B See the acidic strength of aromatic acid |
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| 379. |
Methyl acetate and ethyl acetate can be distinguished by:A. hot alakline `KMnO_(4)`B. neutral `FeCl_(3)`C. Iodoform testD. none of these |
| Answer» Correct Answer - C | |
| 380. |
Which compound will be formed when ethyl acetate and excess of ethyl magnesium bromide allowed to react and the product is hydrolysed ?A. 3-Ethyl -3-pentanolB. 3-Methyl-3-pentanolC. Hexan-3-olD. 2-Methyl-2-propanol |
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Answer» Correct Answer - B `{:(" "O" "C_(2)H_(5)),(" ||"" |"),(CH_(3) - C - OC_(2)H_(5) overset((i)2C_(2)H_(5)MgBr)overset((ii) H_(2)O)rarr CH_(3) - C - OH + Mg (OH) Br + Mg (OC_(2)H_(5)) Br ),(" |"),(" "C_(2)H_(5)),(" 3-Methyl -3-pentanol"):}` Don't Know..
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| 381. |
Reaction of ethyl acetate with excess of `CH_(3)MgI` followed by hydrolysis gives :A. `n-`Propyl alcoholB. tert. Butyl alcoholC. PropanalD. Isopropyl alcohol |
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Answer» Correct Answer - B See properties of esters |
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| 382. |
Urea reacts with malonic ester to give:A. cyanuric acidB. semicarbazideC. urethanD. barbituric acid |
| Answer» Correct Answer - D | |
| 383. |
The compound formed when malonic ester is heated with urea isA. butyric acidB. cinamic acidC. barbituric acidD. crotonic acid |
| Answer» Correct Answer - C | |
| 384. |
Malonic acid on heating gives acetic acid while succinic acid on heating givesA. butyric acidB. propionic acidC. succinic anhydrideD. oxalic acid |
| Answer» Correct Answer - C | |
| 385. |
Malonic acid on heating gives ......... while on decarboxy-lation gives ......... .A. acetic acid, ethaneB. propanoic acid, methaneC. propanoic acid, ethaneD. acetic acid, methane |
| Answer» Correct Answer - D | |
| 386. |
Which aromatic acid among the following is weaker than simple benzoic acid?A. B. C. D. |
| Answer» Correct Answer - C | |
| 387. |
Salicylic acid on brornination gives:A. 2,4,6-tribromosalicylic acidB. 2,4,6-tribromophenolC. 2,4,6-tribromobenzoic acidD. p-bromosalicylic acid |
| Answer» Correct Answer - B | |
| 388. |
Which of the following may be used as a food preservative?A. BenzeneB. Sodium benzoateC. TolueneD. Sodium meta-aluminate |
| Answer» Correct Answer - B | |
| 389. |
Which order is correct about acidity?A. `C_(6)H_(5)OH gtC_(6)H_(5)COOHgtCH_(3)COOH`B. `C_(6)H_(5)OH gt CH_(3)COOHgt C_(6)H_(5)COOH`C. `CH_(3)COOH gt C_(6)H_(5)COOH gt C_(6)H_(5)OH`D. `C_(6)H_(5)COOH gt CH_(3)COOH gtC_(6)H_(5)OH` |
| Answer» Correct Answer - D | |
| 390. |
Which of the following is strongly acidic?A. o-Nitrobenzoic acidB. p-Nitrobenzoic acidC. m-Nitrobenzoic acidD. o-Nitrophenol |
| Answer» Correct Answer - A | |
| 391. |
Which of the following compounds would not evolve `CO_(2)` when treated with `NaHCO_(3)` solution?A. Salicylic acidB. PhenolC. Benzoic acidD. 4-Nitrobenzoic acid |
| Answer» Correct Answer - B | |
| 392. |
Which of the following is the most acidic?A. B. C. D. |
| Answer» Correct Answer - B | |
| 393. |
Consider the following compounds, which of these will release `CO_(2)` with 5% `NaHCO_(3)`? A. (i), (ii) and (iii)B. (i) and (iii)C. (ii) and (iii)D. (i) and (ii) |
| Answer» Correct Answer - C | |
| 394. |
Which of the following has the lowest `pK_(a)` value?A. `CH_(3)-CH_(2)-overset(O)overset(||)C-OH`B. `CH_(2)=CH-overset(O)overset(||)C-OH`C. D. `H-CequivC-overset(O)overset(||)C-OH` |
| Answer» Correct Answer - D | |
| 395. |
In the anion `HCOO^(-)` the two carbon-oxygen bonds are founds to be of equal length. What is the reason for it?A. The anion `HCOO^(-)` has two equivalent resonating structuresB. The anion is obtained by removal of a proton from the acid moleculeC. Electronic orbitals of carbon atom are hybridisedD. The `C = O` bond is weaker than the `C - O` bond |
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Answer» Correct Answer - A See chemical properties of acids |
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| 396. |
In which of the following the `C - O` bonds are equal lengthA. `CH_(3) COO^(-)`B. `CH_(3)COOH`C. `CH_(3)COOH_(3)`D. In all |
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Answer» Correct Answer - A Acetate ion has two equivalent resonating structures, others have non-equivalent resonating structure |
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| 397. |
Which acid has lowest `pK_(a)`A. `p-`Methoxybenzoic acidB. `p-`Chlorobenzoic acidC. `p-`Aminobenzoic acidD. `p-`toluic acid |
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Answer» Correct Answer - B Among the substituents given chloro group has stronger electron withdrawing effect and hence is strongest acid with highest `K_(a)` and lowest `pK_(a)` value respectively |
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| 398. |
When `CH_(2)=CH -CO OH` is reduced with `LiAlH_(4)` the compound obtained will beA. `CH_(3)CH_(2)COOH`B. `CH_(3)H_(2)CHO`C. `CH_(3)CH_(2)CH_(2)OH`D. `H_(2)C=CHCH_(2)OH` |
| Answer» Correct Answer - D | |
| 399. |
Silver salt of which of the following acids on treatment with bromine will form 2-bromopropane ?A. Propanoic acidB. Butyric acidC. Isobutyric acidD. Gluteric acid |
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Answer» Correct Answer - C `CH_(3) underset(CH_(3))underset(|)(CH) - COOAg overset(+Br_(2), C Cl_(4))rarr underset(2-"Bromopropane")(CH_(3) underset(CH_(3))underset(|)(CH) - Br) + CO_(2) + AgBr` |
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| 400. |
The acid showing salt like character in aqueous solution isA. Acetic acidB. Benzoic acidC. Formic acidD. `alpha-` Aminoacetic acid |
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Answer» Correct Answer - D `alpha-` Amino acids exist as Zwitter ion `underset(alpha-"Amino acid")underset(NH_(2))underset(|)(R - CH -) COOH rarr underset("internal salt structure")underset("Zwitter ion or")underset(+NH_(3))underset(|)(R - CH -) COO^(-)` |
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