InterviewSolution
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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.
| 501. |
Molecular formula `C_3H_3O` showsA. chain and optical isomersB. position and functional isomersC. functional and metamersD. chain and position isomers |
| Answer» Correct Answer - B | |
| 502. |
How many O-H groups are present in phloroglucinol ?A. 3B. 2C. 4D. 5 |
| Answer» Correct Answer - A | |
| 503. |
The correct order of strength of acidity of the following compounds is A. (ii) `gt` (i) `gt` (iii) `gt` (iv)B. (i) `gt` (ii) `gt` (iii) `gt` (iv)C. (iv) `gt` (iii) `gt` (ii) `gt` (i)D. (iv) `gt` (iii) `gt` (i) `gt` (ii) |
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Answer» Correct Answer - D Presence of eletron withdrawing groups such as nitro group enhaces the acidic strenght of phenol and the presence of electron releasing groups such as alkyl group decreases the acidic strength of phenol. |
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| 504. |
IUPAC name of following compound is A. pent-2-yn-5-olB. pent-3-yn-1-olC. pentane-2-yn-5-olD. pentane-3-yn-1-ol |
| Answer» Correct Answer - B | |
| 505. |
Which of the following is most acidic ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 506. |
The dimer of methyl alcohol will have strectureA. `H-O-undersetundersetH|oversetoversetH|C-H-O-CH_3`B. `CH_3-undersetundersetH|O…..undersetundersetH|O-CH_3`C. `H-O-CH_3… CH_3-O-H`D. `CH_3-undersetundersetH|O…H-O-CH_3` |
| Answer» Correct Answer - D | |
| 507. |
Nitrating mixture consists ofA. conc. `HNO_3` + conc. HClB. conc. `HNO_3` + conc. `H_2SO_4`C. conc. `H_2SO_4` + conc. `H_3PO_4`D. conc. HCl + conc. `H_2SO_4` |
| Answer» Correct Answer - B | |
| 508. |
Which of the following is most soluble in waterA. `CH_3-OH`B. `C_2H_5-Cl`C. `CH_3-O-CH_3`D. `C_2H_5-OH` |
| Answer» Correct Answer - A | |
| 509. |
Diazotisation reaction is used to prepareA. alcoholB. phenolC. aldehydeD. ketone |
| Answer» Correct Answer - B | |
| 510. |
Which of the following exhibit highest B. P. ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 511. |
Alcohols exhibitA. chain isomerismB. position isomerismC. optical isomerismD. all of these |
| Answer» Correct Answer - D | |
| 512. |
Phenol on treatment with conc. `HNO_(3)` givesA. picric acidB. `o^(-)` and p-bromophenolC. mi-nitrophenolD. none of these |
| Answer» Correct Answer - A | |
| 513. |
In diazotisation reaction, carbolic acid is prepared fromA. curneneB. chlorobenzeneC. anilineD. sod. phenoxide |
| Answer» Correct Answer - C | |
| 514. |
Cumene isA. phenyl n-propaneB. 2-propyl benzeneC. chlorobenzeneD. benzene |
| Answer» Correct Answer - B | |
| 515. |
Salicylic acid is prepared from phenol by the reaction known asA. Wurtz reactionB. Williamson reactionC. Kolbes-Schmidt reactionD. esterification |
| Answer» Correct Answer - C | |
| 516. |
Which of the following has more `pKa` value ?A. B. C. D. |
| Answer» Correct Answer - A | |
| 517. |
Reaction of phenol with dil. `HNO_(3)` givesA. picric acidB. `o^(-)` and p-nitrophenolsC. `o^(-)` and m-nitrophenolsD. `o^(-)` and m - nitrophenols |
| Answer» Correct Answer - B | |
| 518. |
Assertion : Picric acid is a strong acid inspite of the absence of the carboxyl group. Reason : The three `-NO_(2)` groups in picric acid activate the phenate ion.A. if both assertioon and reason are true and reason is the corrct explanation of assertion.B. If both assertion and reason are ture but reason is not the corrcet explanation of assertion.C. If assertion is true but reason is false .D. if both assertion and reason are false. |
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Answer» Correct Answer - C Three `-NO_2` groups in picric acid deactivate the phenolate ion.Due to elcron withdrawing nature of `-NO_2` groups, picric acid becaomes stronger acid that phenol. |
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| 519. |
Cumene is converted in phenol byA. reduction and decomposition by acidB. oxidation and decomposition by acidC. reduction and decomposition by alkaliD. oxidation and decomposition by alkali |
| Answer» Correct Answer - B | |
| 520. |
When phenol reacts with benzene diazonium chloride , the product obtained is `:`A. phenylhydrazineB. p-amino azobenzeneC. phenol hydroxylamineD. p-hydroxy azobenzene |
| Answer» Correct Answer - D | |
| 521. |
Benzene is obtained from phenol by usingA. Na metalB. Ca metalC. Zn metalD. NaOH |
| Answer» Correct Answer - C | |
| 522. |
Product of the following reaction is A. 2-hydroxybenzoicacidB. 2-hydroxybenzaldehydeC. sodium benzoateD. sodium phenoxide |
| Answer» Correct Answer - A | |
| 523. |
Phenol isA. strong acidicB. weak acidicC. strong basicD. neutral |
| Answer» Correct Answer - B | |
| 524. |
Which of the following group destabalise the phenoxide ion?A. `NO_2`B. `-CHO`C. CORD. OH |
| Answer» Correct Answer - D | |
| 525. |
Cresols haveA. 2-OH groupsB. 4-OH groupsC. 1-OH groupD. 5-OH groups |
| Answer» Correct Answer - C | |
| 526. |
Which of the following statement is correct ? 1. electron withdrawing groups stabilize the phenoxide ion and increase the acidic strength 2. electron donating groups destabilise the phenoxide ion and decrease the acidic strength. 3. -OH group in phenol is ortho and para directing. 4. Intermolecular H-bonding is present in phenolA. 1, 3B. 1, 2C. 3, 4D. 1, 2, 3, 4 |
| Answer» Correct Answer - D | |
| 527. |
Which of the following group stabilise the phenoxide ion ?A. `CH_3`B. OHC. ORD. `NO_2` |
| Answer» Correct Answer - D | |
| 528. |
Product of the following reaction is A. 2-hydroxybenzaldehydeB. 2-hydroxybenzoicacidC. benzoic acidD. benzaldehyde |
| Answer» Correct Answer - A | |
| 529. |
Benzene diazonium chloride is converted into phenol byA. oxidationB. reductionC. neutralisationD. hydrolysis |
| Answer» Correct Answer - D | |
| 530. |
Assertion: Resorchiral turns `FeCI_(3)` solution purple. Reason: Reasorcinal has phenolic group.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture. |
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Answer» Correct Answer - A Phenols on treatement wityh netural `FeCI_(3)` solution produce purple colour, resorcinol contains phenolic group hence in treatement with `FeCI_(3)` solution it gives purple colour. Here both assertion and reason are correct and reason is a correct explanantion of assertion. |
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| 531. |
Which one of the following compounds has the most acidic nature?A. B. C. D. |
| Answer» Correct Answer - B | |
| 532. |
Which one of the following compounds has the most acidic nature?A. B. C. D. |
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Answer» Correct Answer - B Phenyl is an electron withdrawing substituent while `-CH_(3)` is an electron releasing sunstituent. Moreover, phenoxide ion is more resonance stabilished as compared to benzy`1` oxide ion, thus release proton more easily. Thus strong acid among the given options. |
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| 533. |
One mole of an organic compound A with the formula `C_(3)H_(8)O` reacts completely with two moles of HI to form X and Y. When Y is boiled with aquous alkali it forms Z.Z answers the iodoform test. The compound A isA. propane-2-olB. propane-1-olC. ethoxyethaneD. methoxyethane |
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Answer» Correct Answer - D Molecular formula `C_(3)H_(8)O(C_(n)H_(2n+2)O)` suggests that the organic compound is either alochol or ether. Since, the compound on reaction will HI gives two different compounds, it must be an unsymmetrical ether, and its formula must be `CH_(3)OC_(2)H_(5)` (methoxyethane). `underset("Methoxyethane")(CH_(3)OC_(2)H_(5))+2HI rarr underset("X")(CH_(3)I)+underset("Y")(C_(2)H_(5)OH)` `C_(2)H_(5)OH+underset("Aqueous")(6NaOH)+4I_(2) rarr underset("Iodoform")(CHI_(3))+HCOoverset(-)Ooverset(+)Na+5H_(2)O+"5NAI"` |
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| 534. |
Lucas reagent isA. anhydrous `ZnCl_2` dissolved in conc. `HNO_3`B. hydrous `ZnCl_2` dissolved in conc. HClC. anhydrous `ZnCl_2` dissolved in conc. HClD. anhydrous `ZnCl_2` dissolved in dil. HCl |
| Answer» Correct Answer - C | |
| 535. |
Low molecular weight alcohols areA. soluble in waterB. soluble on heatingC. insoluble in waterD. insoluble in all solvent |
| Answer» Correct Answer - A | |
| 536. |
Alcohols of low molecular weight areA. insoluble in all solventsB. insoluble in waterC. soluble in water at room temperatureD. soluble in water on heating |
| Answer» Correct Answer - C | |
| 537. |
Explain why low molecular mass alcohols are soluble in water ? |
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Answer» Solubility of alcohols and phenols in water is due to their ability to form hydrogen bond with water molecule. The hydrocarbon part methoxy methane (i.e., R group) tends prevent the formation of hydrogen bonds. Alcohols with lower molar mass will have smaller hydrocarbon part and therefore tendency to form hydrogen bonding is more and they are more soluble in water. `underset("(Molar soluble)")(CH_(3)CH_(2)OH) gt underset("(Less soluble)")(CH_(3)CH_(2)CH_(2)OH)` |
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| 538. |
Which of following reducing agent is used to convert carboxylic acid into alcohol ?A. `Na.Hg + H_2O`B. `LiAlH_4`C. `NaBH_4`D. Sn+HCl |
| Answer» Correct Answer - B | |
| 539. |
Phenol on oxidation by chromic acid givesA. B. C. D. |
| Answer» Correct Answer - A | |
| 540. |
Oxidation of ethanol by chromic acid formsA. ethanalB. methanolC. 2-propanoneD. ethanoic acid |
| Answer» Correct Answer - D | |
| 541. |
A compound soluble in conc. `H_(2)SO_(4)`. It does not decolourise bromine in `C Cl_(4)` but oxidised by chromic anhydride in aqueous `H_(2)SO_(4)` within two seconds, turning organs solution to blue, green and then opaque. The original compound is `:`A. an alkeneB. a primary alcoholC. a tertiary alcoholD. an ether |
| Answer» Correct Answer - B | |
| 542. |
Ethyl iodide on treatment with sodium methoxide givesA. `CH_3-O-CH_3`B. `C_2H_5OCH_3`C. `C_2H_5OC_2H_5`D. `C_2H_6` |
| Answer» Correct Answer - B | |
| 543. |
One mole of ethly acetate on treatment with an excess of `LiAlH_(4)` in dry ether and subsequent acidification producesA. 1 mol acetic acid + 1 mol ethyl alcoholB. 1 mol ethyl alcohol + 1 mol methyl alcoholC. 2 moles of ethyl alcoholD. 1 mol of 2-butanol . |
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Answer» Correct Answer - C `underset("Ethyl accetate")(CH_3COOC_2H_5)overset(LiAlH_4//H_3O^+)underset("dry ether")rarrCH_3CH_2OH+C_2H_5OH` |
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| 544. |
What would be the reactant and reagent used to obtain 2,4 - dimethylpentan-3-ol ?A. Propanal and proyl magnesium bromideB. 3-Methybutanal and 2- methyl magnesium iodideC. 2,2-Dimethylpropanone and methyl magnesium iodideD. 2- Methylpropane and isopropyl magnesium iodide |
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Answer» Correct Answer - D `underset("2-Methylpropanal")(CH_3-underset(CH_3)underset(|)"CH")-overset(H)overset(|)C=underset("Isopropyl magnesium iodide")(O+(CH_3)_2CHMgIrarr)` `(CH_3)_2CH-underset(CH(CH_3)_2)underset(|)overset(H)overset(|)C-OMgIoverset(H_2O)rarr(CH_3)CH-underset("2,4-Dimethylpentan-3-ol")(underset(CH(CH_3)2)underset(|)overset(H)overset(|)C-OH)` |
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| 545. |
Following alcohol is the type of A. allylic alcoholB. vinylic alcoholC. aralkyl alcoholD. benzylic alcohol |
| Answer» Correct Answer - B | |
| 546. |
group is present inA. `1^@`R-OHB. `2^@`R-OHC. `3^@` R-OHD. `4^@` R-OH |
| Answer» Correct Answer - C | |
| 547. |
n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent `:`A. `PCl_(5)`B. reductionC. oxidation with potassium dichromateD. ozonlysis |
| Answer» Correct Answer - C | |
| 548. |
Vinyl carbinol isA. `HO-CH_(2)-CH=CH_(2)`B. `CH_(3)-overset(OH)overset(|)( C )=CH_(2)`C. `CH_(3)-CH=CH-OH`D. `CH_(3)-C(CH_(2)OH)=CH_(2)` |
| Answer» Correct Answer - A | |
| 549. |
Ethyl methyl carbinol is,A. n-butyl alcoholB. t-butyl alcoholC. sec. butyl alcoholD. isobutyl alcohol |
| Answer» Correct Answer - C | |
| 550. |
Vinyl carbinol isA. `HO-CH_2-CH=CH_2`B. `CH_3-undersetunderset(OH)|C=CH_2`C. `CH_3-CH=CH-OH`D. `CH_2=CH-OH` |
| Answer» Correct Answer - A | |