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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. |
An alkene, `C_(7)H_(14)` on reductive ozonolysis gave propanal and a ketone. The probable ketone isA. AcetoneB. Ethyl methyl ketoneC. 2-PentanoneD. 3-Pentanone. |
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Answer» Correct Answer - B The aldehyde is `CH_(3)CH_(2)CHO`. The ketone can have four carbon atoms. It is therefore ethyl methyl ketone. |
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| 352. |
An alkene (A) on ozonolysis gives (B) as one of the product, (B) can perform Cannizzaro reaction.(A) is :A. but-2-eneB. isobuteneC. `(CH_(2))_(2)C=C(CH_(3))_(2)`D. `C_(6)H_(5)CH_(2)CH=CH-CH_(3)` |
| Answer» Correct Answer - B | |
| 353. |
Ozonolysis of `C_(7)H_(14)` gave `2`-methylpentan-`3`-one. The alkene isA. 2-ethyl-3-methylbut-1-eneB. 2-methyl-3-ethylbut-3-eneC. 2,5-dimethyl-3,4-diethylhex-3-eneD. 2,-methyl-3,-ethylbut-1-ene |
| Answer» Correct Answer - A | |
| 354. |
Benedict solution providesA. `Ag^(+)`B. `Li^(+)`C. `Cu_(2+)`D. `Ba^(2+)` |
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Answer» Correct Answer - C `Cu^(2+)` |
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| 355. |
Polarization of electrons in acrolein may be written as:A. `overset(delta-)"CH"_(2)=CH-overset(delta+)"CH"=O`B. `overset(delta-)"CH"_(2)=CH-CH=overset(delta+)"O"`C. `overset(delta+)"CH"_(2)=CH-overset(delta-)"CH"=O`D. `overset(delta+)"CH"_(2)=CH-CH=overset(delta-)"O"`. |
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Answer» Correct Answer - D Polarization of electrons in acrolein can be written as `overset(delta+)("CH"_(2))=CH-CH=overset(delta^(-))("O ")` This is because acrolein can be considered to be a resonance hybrid of the following two structure. |
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| 356. |
The product of methyl magnesium iodide and ethanal is hydrolysed. The final product isA. 1 - PropanolB. 2 - PropanolC. EthanolD. 2-Chloro-1-propanol. |
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Answer» Correct Answer - B `CH_(3)CHOoverset((i)CH_(3)Mgl)underset((ii)HOH)rarrunderset("Propan-2-ol")(CH_(3)-overset(OH)overset("| ")"CH"_(3))+Mg(OH)I` |
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| 357. |
Match the compouns`//ions` Column I with their properties`// reactions` in Column II. |
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Answer» Correct Answer - `Ato p,q,s ," " Bto q,r," " Cto q,r,s, " " Dto q,r.` |
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| 358. |
The reaction of methyl magnesium iodide with acetone followed by hydrolysis give secondery butanol. |
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Answer» Correct Answer - F |
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| 359. |
Consider all possible isomeric ketons including stereoisomers of MW`=100` All these isomers are independently reacted with `NaBH_(4)` The total of number of ketones that gives a recemic product (S) `is//are` |
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Answer» Correct Answer - 5 |
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| 360. |
Benzaldehyde undergoes aldol condensation in an alkaline medium. |
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Answer» Correct Answer - F |
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| 361. |
`C_(6)H_(5)CHO+CH_(3)CH_(2)CHOoverset("dil.NaOH")rarr` |
| Answer» `C_(6)H_(5)HCO+CH_(3)CH_(2)CHOoverset("dil.NaOH")rarrC_(6)H_(5)CH=underset(OH)underset(|)(C)-CHO` | |
| 362. |
The correct statement regrarding a carbonyl compound with a hydrogen atom on the its alpha-carbon is:A. a carbonyl compound with a hydrogen atom on its alphacarbon rapidly equilibrium with its corresponding enol and this process is known as carboylationB. a carbonyl compound with a hydrogen atom on its alpha carbon rapidly equilibrium with its corresponding enol and this process is known as keto-enol tautomerismC. a carbonyl compound with a hydrogen atom on its alpha carbon naver equilibrium with its corresponding enolD. a carbonyl compound with a hydrogen atom on its alpha carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibrium |
| Answer» Correct Answer - B | |
| 363. |
A writing reaction with an aldehyde gives :A. ketoneB. a long chain fatty acidC. oldfin compoundD. epoxide |
| Answer» Correct Answer - C | |
| 364. |
The grouping is presetn in :A. ethersB. alcoholsC. ketonesD. None of these |
| Answer» Correct Answer - C | |
| 365. |
The carbon atom of the carbonyl group is :A. sp-hybidizedB. `sp^(2)` hybridizedC. `sp^(3)` hybridizedD. `dsp^(2)` hybridized |
| Answer» Correct Answer - B | |
| 366. |
A and B are functional isomers of compound `C_(3)H_(6)O`. On heating with `NaOH` and `I_(2)` isomer A froms yellow percipitate of iodoform whereas isomer B does not form any precipitate. Write the formulae of A and B. |
| Answer» The functional isomers are `CH_(3)COCH_(3)[A]` and `CH_(3)CH_(2)CHO[B]`. The isomer [A] has a methyl ketonic group `(CH_(3)CO-)` and responds to iodoform test while the isomer [B] does not since this group is not present. | |
| 367. |
Aldehyde functional group can occur :A. anywhere in the carbon chainB. in the middle of carbon chainC. only at the second carbon of the chainD. only at the end carbon atom of the carbon chain |
| Answer» Correct Answer - D | |
| 368. |
Write chain and functional isomers of `C_(4)H_(8)O`. |
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Answer» `CH_(3)CH_(2)CH_(2)CHO` and `CH_(3)underset(CH_(3))underset(|)(C)HCHO` Functional isomers `CH_(3)CH_(2)CH_(2)CHO` and `CH_(3)COCH_(2)CH_(3)` |
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| 369. |
Aldol condensation between which of the following compounds followed by dehydration gives mesityl oxide?A. Two molecules of `CH_(3)COCH_(3)`B. Two molecules of `CH_(3)CHO`C. `CH_(3)CHO and HCHO`D. `CH_(3)CHO and CH_(3)COCH_(3)` |
| Answer» Correct Answer - A | |
| 370. |
Describe the following i. Acetylation ii. Cannizzaro reaction iii. Cross aldol condensation iv. Decarboxylation |
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Answer» i. Acetylation ii. Cannizzaro reaction iii. Cross aldol condensation iv. Decarboxylation |
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| 371. |
Tautomerism is exhibited byA. B. C. D. |
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Answer» Correct Answer - A::C::D |
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| 372. |
Among the following compounds , which will react with acetone to give a product containing A. `C_(6)H_(5)NH_(2)`B. `(CH_(3))_(3)N`C. `C_(6)H_(5)NHNH_(5)`D. `C_(6)H_(5)NHNH_(2)` |
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Answer» Correct Answer - A::D |
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| 373. |
Aldehydes that do not undergo aldol condensation areA. PropanalB. trichloroethanalC. methanalD. Ethanal. |
| Answer» Correct Answer - D | |
| 374. |
Which of the following will undergo aldol condensation?A. AcetaldehydeB. PropanaldehydeC. BenzaldehydeD. Trideutero acetaldehyde |
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Answer» Correct Answer - A::B::D |
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| 375. |
Which of the following compounds can undergo both Cannizzaro reaction as well as Aldol condensation ?A. HCHOB. `C_(6)H_(5)CHO`C. `CH_(3)CHO`D. `(CH_(3))_(2)CHCHO` |
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Answer» Correct Answer - D `alpha`-Monolkylated aldehydes generally undergo both Cannizzaro reaction as well as Aldol condensation. |
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| 376. |
Acetone givs additon elimination reaction withA. `NH_(2)OH`B. `NaHSO_(3)`C. `NH_(2)NHCONH_(2)`D. `NH_(2)NHC_(6)H_(5)` |
| Answer» Correct Answer - A::C::D | |
| 377. |
Which of the following will undergo aldol condensation?A. AcetaldehydeB. BenzaldehydeC. FormaldehydeD. Trichloroacetaldehyde. |
| Answer» Correct Answer - C | |
| 378. |
Which of the following compounds will not undergo aldol condensation when treated with an alkali?A. AcetoneB. FormaldehydeC. AcetaldehydeD. Benzaldehdye |
| Answer» Correct Answer - B::D | |
| 379. |
Which of the following will undergo aldol condensation ?A. AcetaldehydeB. benzaldehydeC. PropionaldehydeD. Tirdeutero acetaldehdye |
| Answer» Correct Answer - A::C::D | |
| 380. |
The diketone `CH_(3)-overset(overset(O)(||))(C)-(CH_(2))_(2)-overset(overset(O)(||))(C)-CH_(3)` on intermolecular aldol condensation gives the final productA. B. C. D. |
| Answer» Correct Answer - C | |
| 381. |
`(CH_(3))_(3) C - CHO` does not undergo aldol condensation due toA. three electron donating methyl groupsB. cleavage takig palce between `-C-CHO` bondC. absence of alpha hydrogen atom in the moleculeD. bulky `(CH_(3))_(3)C-` group |
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Answer» Correct Answer - C `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CHO` does not undergo aldol condensation because it does not contain `alpha`-hydrogen atom |
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| 382. |
Upon treatment with `Al(OEt)_(3)` followed by ususal reactions (work up), `CH_(3)CHO` will produce:A. only `CH_(3)COOCH_(2)CH_(3)`B. a mixture of `CH_(3)COOH and EtOH`C. only `CH_(3)COOH`D. only EtOH |
| Answer» Correct Answer - A | |
| 383. |
Which of the following reactions reaction would give propanal?A. Ethyl propanoate +`DBAL//H_(2)O`B. Poopyl poropanoate +` DBAL//H_(2)O`C. Ethylcyanide +DBALD. Propanoyl chloride +LBAH |
| Answer» Correct Answer - A::B::C::D | |
| 384. |
Identify the compounds that will undergo nucleophilic aromatic substitution reaction :A. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 385. |
`CH_(3)-underset(CH_3)underset(|)overset(CH_(3))overset(|)C-CHO` does not show aldol condensation because :A. carbon is bounded by 3- heavy methyl groupsB. due to the absence of `alpha` hydrogenC. it is a neutral moleculeD. due to hindrance created by methyl group for carbanion |
| Answer» Correct Answer - B | |
| 386. |
Which of the following are crossed aldol products in the given reaction ? `MeCHO+MeCH_(2)overset(overset(Θ)(OH))underset(25^(@)C)rarr`A. B. C. D. |
| Answer» Correct Answer - C::D | |
| 387. |
In a Cannizaro reaction the intermediate that will be the best hydride donor isA. B. C. D. |
| Answer» Correct Answer - C | |
| 388. |
Write the structural formula of the main organic product formed when methanal reacts with ammonia. |
| Answer» Hexamethylene tetramine `(CH_(2))_(6)N_(4)` or Urotropine. | |
| 389. |
Match the carbonyls from left column with their characteristics from right column : |
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Answer» Correct Answer - `Ararrq,r,t; B to p,qs; C rarr p; D to r,s,t` |
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| 390. |
if ethanedial (HOC-COH) is teated with excess of HCN (aq) followed by hydrolysis of product results in diacids. How many different diacids would be formed ? |
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Answer» Correct Answer - 3 |
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| 391. |
Among the given compounds, the most susceptible to nucleophilic attack at the cabonyl group is:A. MeCOClB. MeCHOC. MeCOOMeD. MeCOOCOMe |
| Answer» Correct Answer - A | |
| 392. |
A nucleophilic reagent will readily attackA. EthyleneB. EthanalC. EthanolD. Ethylamine. |
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Answer» Correct Answer - B Aldehydes give nucleophilic addition reactions. |
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| 393. |
On passing a mixture of ethylene and oxygen under pressure, into an aqueous solution of palladium and cupric chloride at `50^(@)C` givesA. EthanolB. EthanalC. Diethyl etherD. Ethanoic acid. |
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Answer» Correct Answer - B It is Wacker process to prepare ethanal on large scale. `CH_(2)-CH_(2)+(1)/(2)O_(2)overset(Pd^(2+)//CuCl_(2))rarrunderset("Ethanal")(CH_(3)CHO)` |
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| 394. |
Ethanal to 3-hydroxybutanal |
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Answer» Ethanal to 3-hydroxybutanal `underset("Ethanal")(2CH_(3)CHO)underset("Condensation")overset("Aldol")rarrunderset("3-Hydroxybutanal")(CH_(3)underset(OH)underset(|)(C)HCH_(2)CHO)` |
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| 395. |
Enthanal reacts with alkali to give 3-hydroxybutanal. The reacation is:A. polymerisationB. Claisen condensationC. aldol condensationD. none of these |
| Answer» Correct Answer - C | |
| 396. |
3-hydroxybutanal formed when X reacts whith Y in dilute Z solution. What are X, Y, and Z?A. `CH_(3)CHO,(CH_(3))_(2)CO,NaOH`B. `CH_(3)CHO,CH_(3)CHO,NaCl`C. `(CH_(3))_(2)CO,(CH_(3))_(2)CO,HCl`D. `CH_(3)CHO.CH_(3)CHO,NaOH`. |
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Answer» Correct Answer - D `CH_(3)-overset(O)overset(||)underset((X))underset(H)underset(|)"C"+underset("(Y) ")(overset(H)overset(|)"CH"_(2)-overset(O)overset(||)C-H)overset("dil.NaOH(Z)")rarrunderset("3-Hydroxybutanal")(CH_(3)-overset(OH)overset("| ")"CH"-CH_(2)-CH)` |
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| 397. |
Acetone forms bisulphite compound when heated with sodium bisulphate whears di-tertiary butyl ketone fails to do so. Explain. |
| Answer» Di-tertiary butyl ketone `(CH_(3))_(3)C-overset(O)overset(||)C-C(CH_(3))_(3)` is a highly sterically hindered compound. The attack of `sHSO_(3)^(-)` (nucleophile) on the carbonyl group is not possible wheares it can readily take place in acetone. | |
| 398. |
Arrange the following compounds in order of increasing reactivity towards HCN : Acetaldehyde, Acetone, Di-tertiary butyl ketone, Methyl tertiary butyl ketone. |
| Answer» The order of reactivity is linked with the steric hindrance or crowding of the groups around the carbonyl group. Greater the extent of steric hindrance, lesser will be the reactivity. The increasing order of reactivity towards HCN (or `CN^(-)` ion) is : Di-tertiary butyl ketone `lt` Methyl tertiary butyl ketone `lt` Acetone `lt` Acetaldehyde. | |
| 399. |
What happens when ethylbenzene is heated with acidified `K_(2)Cr_(2)O_(7)` ? |
| Answer» Benozic acid is formed | |
| 400. |
Aldehydes and ketones ar specially susecptible to nucleophilic addition because carbonyl group is polar (due to electronegativity difference between carbon and oxygen) Positive charge on carbon makes it reactive towards the nucleophili. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases with increases in the electron deficiency at carbonyl carbon. Thus, (-I.E.)groups increase while (+I.E.) groups decrease the reactivity of carbonyl compound. Carbonyl compounds show nucleophilic addition with :A. HCNB. `NaHSO_(3)`C. `(CH_(3)OH+HCl)`D. all of these |
| Answer» Correct Answer - D | |