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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.
| 301. |
Acetaldehyde is :A. oxidising agentB. reducing agentC. both oxidising as well reducing agentD. none of the above |
| Answer» Correct Answer - C | |
| 302. |
An acylic hydrocarbon P, having molecular formula `C_(6)H_(10)`, gives acetone as the only organic product through the following sequnence of reactions in which Q is an intermediate organic compound The structure of compound P isA. `CH_(3)CH_(2)CH_(2)CH_(2)-C=C-H`B. `H_(3)CH_(2)C-C-=C-CH_(2)OH`D. |
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Answer» Correct Answer - D is the correct structure of the compound P. |
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| 303. |
(A) `-CHO` group can be easily oxidised to `-COOH` group even with mild oxidant. (R) `-COOH` group can be easily reduced back to `-CHO` group by using `LiAlH_(4)`.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 | |
| 304. |
For obtaining butan-2-one from acetyl chloride, which of the following reagent can be employed?A. Grignard reagentB. HIC. `H_(2),Pd-BaSO_(4)`D. Diethyl cadmium |
| Answer» Correct Answer - D | |
| 305. |
The compound `C_(6)H_(6)-O-overset(O)overset(||)C-C_(6)H_(5)` can be prepared by the reaction of :A. phenol and benzoic acid in the presence of NaOHB. phenol and benzoyl chloride in the presence of pyridineC. phenol and benzoyl chloride in the presence of `ZnCl_(2)`D. phenol and benzaldehyde in the presence of palladium |
| Answer» Correct Answer - B | |
| 306. |
Aldol condensation will not occur inA. HCHOB. `CH_(3)CH_(2)CHO`C. `CH_(3)COCH_(3)`D. `CH_(3)CHO` |
| Answer» Correct Answer - A | |
| 307. |
Write the IUPAC name of the following (i) `(CH_(3))_(2)CHCHO` , (ii) |
| Answer» (i) 2-Methylpropanal , (ii) 2-Methylcyclohexanone. | |
| 308. |
Write IUPAC name of `CH_(3)-underset(Br)underset(|)CH-underset(CHO)underset(|)(C)H-CH_(3)` |
| Answer» 3-Bromo-2-methylbutanal. | |
| 309. |
Write the IUPAC name of `CH_(3)-CH_(2)-CH=CH-overset(O)overset(||)(C)-H` |
| Answer» `overset(5)(C)H_(3)-overset(4)(C)H_(2)-overset(3)(C)H=overset(2)(C)H-overset(O)overset(||)(C^(1))-H` | |
| 310. |
Write the IUPAC name of the following compound `CH_(3)-underset(OCH_(2))underset(|)(C)H-overset(O)overset(||)(C)-underset(CH_(3))underset(|)(C)H-Cl` |
| Answer» 2-chloro-4-methoxypetan-3-one. | |
| 311. |
Write the IUPAC name of the following compounds: (i) `CH_(3)-underset(CH_(3))underset(|)(CH)-CO-underset(CH_(3))underset(|)(CH)-CH_(3)` (ii) `CH_(3)COCH_(2)COCH_(3)` (iii)`H_(3)C-overset(O)overset(||)(C)-CH_(2)-overset(Cl)overset(|)(CH)-CH_(3)` (iv) `CH_(3)-underset(OH)underset(|)(CH_(2))-overset(O)overset(||)(C)-CH_(3)` (v) |
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Answer» (I) 2,4-Dimethylpentan-3-one (ii) Pentan-2,4-dione. (iii) 4-chloropentan-2-one (iv) 4-Hydroxypentan-2-one (v) 2-Hydroxybenzaldehyde |
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| 312. |
Write the IUPAC name of compound `(CH_(3))_(2)C-underset(OH)underset(|)(CH)-CH_(2)-underset(CHO)underset(|)(CH)-CH(CH_(3))_(2)` |
| Answer» 4-Hydroxy-5, 5-dimethyl-2-isopropylpentanal. | |
| 313. |
Aldol condensation will not occur inA. HCHOB. `CH_(3)CH_(2)CHO`C. `CH_(3)COCH_(3)`D. `CH_(3)CHO`. |
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Answer» Correct Answer - D HCHO does not have `alpha` C-atom and hence no `alpha` H-atom. Therefore , it does not give aldol condensation. |
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| 314. |
Which factor/s will increase the reactivity of group? (i)Presence of group with positive inductive effect (ii) Presenceof group with negative inductive effect (iii) Presence of large alkyl groupA. only (i)B. only(ii)C. (i) and (ii)D. (ii) and (iii) |
| Answer» Correct Answer - B | |
| 315. |
In the following reaction sequence, products I, J, and L are formed. `K` represents a reagent. The structures of product `I` is : The structures of compounds `J` and `K`, respectively, are : The structure of product `L` is : A. B. C. D. |
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Answer» Correct Answer - D `NaBH_(4)` reduces CHO selectively into `CH_(2)OH`, which is further converted into corresponding bromide by `PBr_(3)` without affecting the triple bond. |
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| 316. |
Which of the following reactions can produce `R-CO-Ar` ?A. `ArCOCl+H-Aroverset(AlCl_(3))rarr`B. `COCl+RMgXrarr`C. `R+CrO_(3)rarr`D. `RCOCl+H-Aroverset(AlCl_(3))rarr` |
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Answer» Correct Answer - A `RCOCl+Ar-Hoverset(AlCl_(3))rarrR-overset(O)overset(||)C-Ar+HCl` |
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| 317. |
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence ofA. a vinyl groupB. an isopropyl groupC. an acetylene triple bondD. two ethylenic double bonds. |
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Answer» Correct Answer - A `underset("Vinyl group")(gtC=CH_(2))overset((i)O_(3))underset((ii)Zn)rarrgtC=Ounderset("Formaldehyde")(+HCHO)` |
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| 318. |
Formyl chloride has not been prepared so far. Which of the following can function as formyl chloride in formylation?A. HCOOH + HClB. CO + HClC. `HCONH_(2)+HCl`D. `HCOOCH_(3)+HCl` |
| Answer» Correct Answer - B | |
| 319. |
In a Cannizaro reaction the intermediate that will be the best hydride donor isA. B. C. D. |
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Answer» Correct Answer - D The electron with drawing nitro group facilitates the release of hydride ion from the intermediate (D) |
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| 320. |
Arrange the following in the order of their incresing reactivity towards HCN: `CH_(3)CHO, CH_(3)COCH_(3), HCHO, C_(2)H_(5)COCH_(3)` |
| Answer» `C_(2)H_(5)COCH_(3) lt CH_(3)COCH_(3) lt CH_(3)CHO lt HCHO` | |
| 321. |
Which of the following compounds is oxidised to prepare methyl ethyl ketone?A. Propanol-2B. Butanol-2C. Butanol-1D. ter-Butyl alcohol. |
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Answer» Correct Answer - B `CH_(3)CH_(2)-CHOH-CH_(3)overset(Cr_(2)O_(7)^(2-)//H^(+))rarrCH_(3)CH_(2)-overset(O)overset(||)C-CH_(3)` |
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| 322. |
A compound possessing `alpha`-hydrogen atom, in the presence of dilute alkali forms `beta`-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound isA. `CH_(3)CHO`B. `CH_(3)CH_(2)CHO`C. `CH_(2)=CH-CHO`D. `HC=C-CHO` |
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Answer» Correct Answer - A See aldol condensation in the reactions of aldehydes and ketones. |
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| 323. |
Acetone is prepared byA. Oxidation of n-propyl alcoholB. Oxidation of acetaldehydeC. Pyrolysis of calcium acetateD. Pyrolysis of calcium acetate as well as acetic acid. |
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Answer» Correct Answer - D Pyrolysis of calcium acetate as well as acetic acid give acetone. |
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| 324. |
Pentan-2-one and 3-methylbutan-2-one areA. Optical isomersB. Chain isomersC. MetamersD. Tautomers. |
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Answer» Correct Answer - C `CH_(3)C-underset(O)underset(||)C-CH_(2)-CH_(3) and CH_(3)-underset("CH"_(3))underset("| ")"CH"-underset(O)underset(||)C-CH_(3)` are metamers. |
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| 325. |
The enolic form of acetone containsA. 9 `sigma`-bonds, 1 `pi`-bond, 2-lone pairsB. 8 `sigma`-bonds, 2 `pi`-bonds, 1-lone pairC. 10 `sigma`-bonds, 1 `pi`-bond, 2-lone pairsD. 9`sigma`-bonds, 2 `pi`-bonds, 1-lone pair. |
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Answer» Correct Answer - A Enolic from of acetone has lewis structure `H_(2)C=overset(":"overset(..)OH)overset("| ")"C "-CH_(3)` (9 `sigma`-bonds, `1pi`-bonds, 2-lone pairs) |
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| 326. |
Fehling solution consist of two separate alkaline solutions. If one of the these is `CuSO_(4)` then the other is :A. `NaHCO_(3)`B. `Na_(2)SO_(4)`C. `NaKC_(4)O_(6)H_(4)`D. `NaKC_(2)O_(4)`. |
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Answer» Correct Answer - C The other solution is sodium potassium tartarate. |
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| 327. |
you have tow `C_(6)H_(10)O` ketones , I and II. Both are optically active , but is recemised by treatement with bass nanII is bot. Wolff- Kischner reduction of both ketones gives the same achiral gudrocarbon, formula `C_(6)H_(12)^(.)` What reasonable structures may be assigned to I and II?A. I si `3`-methely-`4`- pentaen-`2`-one, II is `4`-methyl-`1`-penten-`3`-oneB. I is `2`-methylcyclopentanone,II is `3`-methyl-cyclopentanoneC. I is `3`-methylcyclopentanone,II is `2`-methyl- cyclopentanoneD. I is `2`-ethylcyclobutanone ,II `3`-ethyl-cyclobutanone |
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Answer» Correct Answer - B |
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| 328. |
(A) , Product (A) is :A. B. C. D. |
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Answer» Correct Answer - B (b) In basic medium halide undergo elimination reaction (`E_(2)` elimination bimolecular). |
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| 329. |
Above conversion can be carried out by :A. Clemmensen reductionB. Wloff-Kishner reductionC. `LiAIH_(4)`D. `NaBH_(4)` |
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Answer» Correct Answer - B (b) Ether are stable in basic medium . |
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| 330. |
The appropriate reagent for the following transformation is A. Zn-Hg, HClB. `NH_(2).NH_(2), OH^(-)`C. `H_(2),Ni`D. `NaBH_(4)`. |
| Answer» Correct Answer - A | |
| 331. |
Which of the following will undergo aldol condensation ?A. TrichloroacetaldehydeB. FormaldehydeC. BenzaldehydeD. Trideuteroacetaldehyde. |
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Answer» Correct Answer - D The isotopic substitution does not change the chemical properties, so replacement of `alpha`-H by `alpha-D` does not change the properties. `2CD_(3)CHOoverset(NaOH)rarrCD_(3)underset(OD)underset("| ")"CH"-CD_(2)CHOoverset(Delta)rarrCD_(3)CH=CDCHO`. |
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| 332. |
The product P in the reaction A. B. C. D. |
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Answer» Correct Answer - D `underset("1, 1-Dichloro propane")(CH_(3)CH_(2)CH_(2)Cl_(2))overset("Aq KOH")rarrCH_(3)CH_(2)CH(OH)_(2)` `overset(P)underset(-H_(2)OH)rarrunderset("Ari aldehyde ")(CH_(3)CH_(2)CHO" x "overset("Alc KOH")underset("DehydroHAlogination")rarr` `CH_(3)CH-=OHoverset(Cu_(2)Cl_(2))underset(NH_(4)OH)rarrCH_(3)C-=Cu.` |
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| 333. |
In the given transformation which of the following is the most appropriate reagent? A. Zn-Hg/HClB. Na in liq. `NH_(3)`C. `NaBH_(4)`D. `NH_(2)-NH_(2).OH^(-)` |
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Answer» Correct Answer - D Both Zn(Hg) HCl and `NH_(2)-NH_(2)," "OH^(-)` can reduce `COCH_(3)` group to `CH_(2)CH_(3)` group but HCl will also bring about substitution of OH by Cl `therefore` the most effective reagent is `NH_(2)-NH_(2)OH`. |
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| 334. |
Increasing order of equilibrium constants for the formation of a hydrate : A. `IV lt III lt II lt I`B. `IV lt III lt I lt II`C. `I lt II lt III lt IV `D. `II lt III lt I lt IV` |
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Answer» Correct Answer - C (c) More positive charge of an ketone more will be reactivity toward `H_(2)O` . Hydrates are more stable when electron withdrawing group are attached . |
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| 335. |
Predict the product in the given reaction : A. B. C. D. |
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Answer» Correct Answer - C m-chlorobenzyl alcohol +m-chlorobenzoate |
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| 336. |
`overset(H_(3)O^(o+))(to) A + B` . Compound (A) & (B) can be differentiated by :A. 2-4 DNPB. Fehling solutionC. Lucas reagentD. `NaHSO_(3)` |
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Answer» Correct Answer - B (b) `A = CH_(3)-CH_(2) - CHO " " ` obtained by hydrolysis of ether. `B = CH_(3)- overset(O)overset(||)(C)-CH_(3) " " ` obtained by hydrolysis of ether . Feeling is used to differentiate aldehyde and ketone . |
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| 337. |
`Ph-CH=CH-overset(O)overset(||)(C)-CH_(3) to Ph - CH = CH- CO_(2)H` Above conversion can be achieved by :A. `KMnO_(4), Delta` followed by `H^(+)`B. `I_(2)//NaOH` followed by `H^(+)`C. `H_(2)//Pt`D. `LiAiH_(4)` |
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Answer» Correct Answer - B (b) Iodoform test . (a) Oxidative ozonolysis by not `KMnO_(4)` (b) Iodoform test . Only methyl ketones . No reaction with double bond . (c) `H_(2)//Pt` can reduce only double bond. (d) LAH oxidizes ketone to `2^(@)` alcohol not to carboxylic acid . |
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| 338. |
Above conversion can be achieved by :A. Wolf-Kishner reductionB. Clemmensen reductionC. `HS-CH_(2)-CH_(2)-SH` , following by Raney NiD. None of these |
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Answer» Correct Answer - D (d) Wolff-kishner reduction carried out in basic condition clemmensen reduction carried out in acidic condition . Epoxide unstable in acidic and basic medium . |
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| 339. |
The conversion of acetophenone into benzoic acid can be achieved by its reaction with :A. sodium hydroxide followed by acidificationB. iodine and sodium hydroxide , followed by acidificationC. hydrooxylamine followed by reaction with `H_(2)SO_(4)`D. m-chloroperoxobenzoic acid |
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Answer» Correct Answer - B (b) `Pb-underset(("Iodoform"))(overset(O)overset(||)(C)-)CH_(3) overset(I_(2)//NaOH)underset(H_(3)O^(o+))(to)Ph-overset(O)overset(||)(C)-OH` |
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| 340. |
The conversion of acetophenone to acetanilide is best accompanied by using :A. Beckmann rearrangementB. Curtius rearrangementC. Lossesn rearrangementD. Holfmann rearrangement |
| Answer» Correct Answer - A | |
| 341. |
Which of the following has most acidic proton :A. `CH_(3)COCH_(3)`B. `(CH_(3))_(2)C=CH_(3)`C. `CH_(3)COCH_(2)COCH_(3)`D. `(CH_(3)CH)_(3)CH`. |
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Answer» Correct Answer - C `CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-OC_(2)H_(5)"(Aceto ester)"` contains two electron withdrawing groups around `CH_(2)` and this `CH_(2)` group is called active methylene group and its hydrogens are acidic. |
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| 342. |
Which of the following gives a small of bitter almonds ?A. BenzaldehydeB. BenzideneC. Benzoic acidD. Benzaldichloride. |
| Answer» Correct Answer - A | |
| 343. |
Oil of bitter almonds is :A. B. C. D. |
| Answer» Correct Answer - B | |
| 344. |
Formaldehyde gives an additive product with Methylmagnesium iodide which in aqueous hydrolysis givesA. ethyl iodideB. ethyl alcoholC. methyl alcoholD. methyl iodide |
| Answer» Correct Answer - B | |
| 345. |
In which of the following the number of carbon atoms are not the same when carboxylic acid is obtained by oxiadation ?A. `CH_(3)COCH_(3)`B. `C Cl_(3)CH_(2)CHO`C. `CH_(3)CH_(2)CH_(2)OH`D. `CH_(3)CH_(2)CHO` |
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Answer» Correct Answer - A Ketones are not easily oxidised. Howerver, under drastic conditions or with powerful oxidising agents such as conc. `HNO_(3),KMnO_(4)//H_(2)SO_(4)` or `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`, cleavage of carbon-carbon bond takes place giving a mixture of carboxylic acids having less number of carbon atoms than the original ketone. `underset("Acetone")(CH_(3)-overset(O)overset(||)(C)-CH_(3))underset("conc. "HNO_(3))overset([O])tounderset("Formic acid ")(HCOOH)+underset("Acetic acid")(CHOOH)` |
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| 346. |
`(CH_(3))_(2)C=CHCOCH_(3)` can be oxidised to `(CH_(3))_(2) C=CHCOOH` byA. chromic acidB. `NaOl`C. `Cu` to `300^(@)C`D. `KMnO_(4)` |
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Answer» Correct Answer - B Haloform reaction, `(CH_(3))_(2)C=CHCOCH_(3)` contains `CH_(3)-overset(O)overset(||)(C)-` unit so it can be oxidised to `(CH_(3))_(2)C=CH-COOH` by NaOI. `CH_(3)-underset(CH_(3))underset(|)(C)=CH-overset(O)overset(||)(C)-CH_(3)overset(NaIO)toCH_(3)-underset(CH_(3))underset(|)(C)=CH-COOH+CHI_(3)` |
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| 347. |
The compound which would yield `5-` Oxo`-2-`methylhexanal on reductive ozonolysisA. B. C. D. |
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Answer» Correct Answer - B |
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| 348. |
Certain ketone A (capable of showing iodoform test positive) on reduction gives B. B on acidic dehydration at 443 K give C. C on reductive ozonolysis gives only MeCHO. A and C in the above sequence are respectivelyA. `CH_(3)COCH_(2)` and `CH_(3)CH=CH_(2)`B. `CH_(3)COC_(2)H_(5)` and `CH_(3)CH_(2)CH=CH_(2)`C. `CH_(3)COC_(2)H_(5)` and `CH_(3)CH=CH-CH_(3)`D. `CH_(3)COC_(2)H_(5)` and `CH_(3)CH_(2)-CH(OH)CH_(3)`. |
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Answer» Correct Answer - C `underset((A))(CH_(3)COC_(2)H_(5))overset("Reduction")underset("LiAlH"_(4))rarrunderset((B))(CH_(3)-overset("OH")overset("|")"C"HCH_(2)CH_(3))overset(H_(2)SO_(4))underset("443 K")rarrunderset((C))(CH_(3)CH=CH-CH_(3))` `"CCl"_(3)CHO+H_(2)Orarrunderset("Chloral hydrate")("CCl"_(3)OH(OH)_(2))` |
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| 349. |
Which alkene upon reductive ozonolysis gives only one product? (b) What is the product of reaction between ethanoyl chloride and dimethyl cadmium? |
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Answer» A symmetrical alkene (e.g. `CH_(3)CH = CHCH_(3)`) (b) `CH_(3)COCH_(3)` |
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| 350. |
One mole of symmetrical alkene upon ozonolysis gives two moles of an aldehyde having the molecular mass `44 u`. Predict the alkene.A. etheneB. propeneC. 1-buteneD. 2-butene. |
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Answer» Correct Answer - D `C_(n)H_(2n)O=44rArrC_(n)H_(2n)=44-16=28` `therefore` n = 2 Hence `CH_(3)-CH=CH-CH_(3)` is a symmetrical `therefore underset("2-Butene")(CH_(3)-CH=CH-CH_(3))overset((i)O_(3))underset((ii)Zn//H_(2)O)rarrunderset("Acetaldehyde")(2CH_(3)-CH=O)` |
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