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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.
| 251. |
Acetyl chloride is reduced to acetaldehyde by :A. `Na//C_(2)H_(5)OH`B. `LiAlH_(4)`C. `H_(2)//Ni`D. `H_(2)//Pd-BaSO_(4)` |
| Answer» Correct Answer - D | |
| 252. |
Vinyl alcohol and ethanal areA. MetameraB. TautomersC. Position isomersD. chain isomers |
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Answer» Correct Answer - B `CH_(2)=CHOH and CH_(3)CH=O` are tautomers. |
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| 253. |
On treatment of acetone with dilute `Ba(OH)_(2)`, the product formed is:A. AldolB. PhoroneC. PropionaldehydeD. 4-Hydroxy-4-methyl-2-pentanone. |
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Answer» Correct Answer - D `{:(" O O OH O"),(" || || | ||"),(H_(3)C-C-CH_(3)+H-CH_(2)-C-CH_(3)overset(Ba(OH)_(2))rarrH_(3)overset(5)Coverset("4 ")-"C"-overset(3)"C"H_(2)overset("2")-C-overset(1)"C"H_(3)),(" |"),(" CH"_(3)),(" Diacetone alcohol"),(" 4-Hydroxy-4-methyl-pentan-2-one"):}` |
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| 254. |
Which of the following represents the formula for 2, 4 DNA ?A. `NH_(2)-NHC_(6)H_(4)(NO_(2))_(2)`B. C. D. None of above. |
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Answer» Correct Answer - B Factual question. |
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| 255. |
Which of the following compounds will give a yellow precipitate with iodine alkali?A. 2-HydroxypropaneB. AcetophenoneC. Methyl acetateD. Acetamide. |
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Answer» Correct Answer - A::B `{:(underset((A))underset("2-Hydroxypropane")(CH_(3)-overset("OH")overset("| ")"CH"-CH_(3))" "underset((B))underset("Acetophenone")(CH_(3)-overset(O)overset("||")C-C_(6)H_(5))),(underset((C))underset("Methyl acetate")(CH_(3)-overset(O)overset("||")C-OCH_(3))" "underset((D))underset("Acetamide")(CH_(3)-overset(O)overset("||")C-NH_(2))):}` Only methyl ketone `(CH_(3)COCH_(2)R)` and methyl carbinols `(CH_(3)CH(OH)CH_(2)R)` give iodoform test. Esters and amides do not give iodoform test. |
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| 256. |
A compound that gives a psitive idoform test isA. 1-pentanolB. 3-pentanoneC. 2-pentanoneD. pentanal |
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Answer» Correct Answer - C |
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| 257. |
`CH_(3)COC_(2)H_(5)ovreset(C_(6)H_(5)CO_(3)H)rarrAoverset("Tischenko")underset("reaction")rarr B` Identify A and B.A. `CH_(3)COOC_(2), CH_(3)CH_(2)OH`B. `CH_(3)COOC_(2)H_(5), CH_(3)CHO`C. `CH_(3)CHO, CH_(3)COOC_(2)H_(5)`D. None of these |
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Answer» Correct Answer - B `CH_(3)COC_(2)H_(5)overset(C_(6)H_(5)CO_(3)H)rarrunderset((A))(CH_(3)COOC_(2)H_(5))` `2CH_(3)CHOoverset((C_(2)H_(5)O)_(3)Al)larr` |
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| 258. |
Identify the product (Y) in the following reaction : A. B. C. D. |
| Answer» Correct Answer - B | |
| 259. |
Which one is most reactive towards nucleophilic addition reaction?A. B. C. D. |
| Answer» Correct Answer - A | |
| 260. |
When calcium benzoate and calcium formate are heated, they form :A. benzaldehydeB. acetophenoneC. benzophenoneD. acetaldehyde |
| Answer» Correct Answer - A | |
| 261. |
Which of the following gives silver mirror with ammoniacal silver nitrate?A. Benzyl alcoholB. benzal chlorideC. Benzioic acidD. Benzene |
| Answer» Correct Answer - B | |
| 262. |
When acetaldehyde is treated with ammoniacal silver nitrate solution, we get:A. silver mirrorB. a brown precipitateC. red colourationD. no precipitate |
| Answer» Correct Answer - A | |
| 263. |
Which of the following compounds will not reduce the ammoniacal silver nitrate ?A. `H-overset(H)overset(|)C=O`B. `H-overset(O)overset(||)C-O-H`C. `H-overset(O)overset(||)C-CH_(2)CH_(3)`D. `H-overset(H)overset(|)underset(H)underset(I)C-OH`. |
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Answer» Correct Answer - D `underset("Methyl alcohol")(H-overset(H)overset(|)underset(H)underset(|)C-OH)` It wil not reduce ammoniacal `AgNO_(3)`. |
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| 264. |
The product formed by the reaction of chlorine with benzaldehyde in the absence of a catalyst isA. ChlorobenzeneB. Benzyl chlorideC. Benzoyl chlorideD. o-Chlorobenzadehyde. |
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Answer» Correct Answer - C `underset("Benzaldehyde")(C_(6)H_(5)CHO+Cl_(2))rarrunderset("Benzoyl chloride")(C_(6)H_(5)COCl+HCl)` |
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| 265. |
which of the following has the most acidic hydrogen?A. `3- "hexanonoe"`B. `2,4-"hoxanedione"`C. `2,5-"heaxnedione"`D. `2,3-"hoxanedione"` |
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Answer» Correct Answer - B |
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| 266. |
The reagent best suitable for the following transformation is : A. `NH_(2)NH_(2),KOH`B. `Zn//Hg, HCl`C. `H_(2)//Ni`D. `NaBH_(4)`. |
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Answer» Correct Answer - B Zn/Hg and HCl can also be used but will dehydrate alcoholic group. Therefore `NH_(2)NH_(2)`. KOH (a) is the best suitable reagent. |
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| 267. |
Ylide is the reagent used inA. Reformatsky reactionB. Fittig reactionC. Wittig reactionD. Perkin reaction. |
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Answer» Correct Answer - C Ylide is the reagent used in Wittig reaction. |
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| 268. |
The compound X isA. BenzenoneB. CarboxybenzeneC. HydroxybenzeneD. Benzene carbaldehyde. |
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Answer» Correct Answer - D It is Gattermann Koch reaction. Benzaldehyde is also known as benzene carbaldehyde. |
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| 269. |
The compound A is :A. B. C. D. |
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Answer» Correct Answer - C It is Oppanauer oxidation and does not oxidise C = C bond. |
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| 270. |
Butane-2, 3-dione on reaction with `PCl_(5)` changes its molecular mass by X amu. The value of X isA. 71B. 142C. 110D. 35.5 |
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Answer» Correct Answer - C `underset(("Mol mass = 86"))(CH_(3)-overset(O)overset(||)C-overset(O)overset(||)C-CH_(3))overset(PCl_(5))rarrunderset("Mol. mass = 196")(CH_(3)-overset(Cl)overset(|)underset(Cl)underset(|)C-overset(Cl)overset(|)underset(Cl)underset(|)C-CH_(3))` Change in mol. mass = 196 - 86 = 110 |
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| 271. |
In the following sequence, product I,J and L are formedK represents a reagent. The structure of compound J and K, respectively areA. B. C. D. |
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Answer» Correct Answer - A |
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| 272. |
Which of the following is/are examples (s) of aldol condensation?A. `2CH_(3)CHOoverset(dil.NaOH)rarrCH_(3)-overset(OH)overset(|)(CH)-CH_(2)-CHO`B. `2CH_(3)-overset(O)overset(||)C-CH_(3)overset(dil.NaOH)rarrCH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-CH_(2)-overset(O)overset(||)C-CH_(3)`C. `2HCHOoverset(dil.NaOH)rarrCH_(3)OH+HCOOH`D. `C_(6)H_(5)CHO+HCHOoverset(dil.NaOH)rarrC_(6)H_(5)CH_(2)OH` |
| Answer» Correct Answer - A::B | |
| 273. |
Which of the following are examples of aldol condensation ?A. `2CH_(3)CHO overset(Dil.NaOH)rarr CH_(3)CHOHCH_(2)CHO`B. `2CH_(3)COCH_(3) overset(Dil.NaOH)rarr (CH_(3))_(2)C(HO)CH_(2)COCH_(3)`C. `2HCHO overset(Dil.NaOH)rarr CH_(3)OH`D. `C_(6)H_(5)CHO+HCHO overset(Dil.NaOH)rarr C_(6)H_(5)CH_(2)OH` |
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Answer» Correct Answer - A::B (a) and (b) have `alpha-H` atoms, so they undergo aldol condensation, (c ) is Cannizzaro reaction, (d) is Claisen-Schmidt reaction. |
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| 274. |
Which of the following are examples of aldol condensation ?A. `2CH_(3)CHOoverset("dil. NaOH")rarrCH_(3)CHOHCH_(2)CHO`B. `2CH_(3)COCH_(3)overset("dil." NaOH)rarrCH_(3)CHOHCH_(3)CH_(2)COCH_(3)`C. `2HCHO overset("dil. NaOH")rarrCH_(3)OH`D. `C_(6)H_(5)CHO+HCHOoverset("dil. NaOH")rarrC_(6)H_(5)CH_(2)OH + HCOCH` |
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Answer» Correct Answer - A::B are both the examples of aldol condensation. |
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| 275. |
Which of the following compounds will reacts with ethanolic KCN ?A. Ethyl chlorideB. Acetyl chlorideC. ChlorobenzeneD. Benzaldehyde |
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Answer» Correct Answer - A::D RX aldehydes and ketones react with alc. KCN. (C ) is aryl halide, it does not undergo. ArSN reaction unless strong EWG (e.g., `(-NO_(2))` group) is present at o-and p-positions. |
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| 276. |
Which of the following compounds will recact with ethanolic KCN?A. Ethyl chlorideB. Acetyl chlorideC. ChlorobenzeneD. Benzaldehyde |
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Answer» Correct Answer - A::B::D |
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| 277. |
Which of the following compounds will recact with ethanolic KCN?A. Ethyl chlorideB. Acetyl chlorideC. ChlorobenzeneD. Benzaldehyde. |
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Answer» Correct Answer - A::D Ethyl chloride and benzaldehyde will react with KCN. |
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| 278. |
Which of the following undergoes aldol condensation ?A. AcetaldehydeB. PropionaldehydeC. BenzaldehydeD. Trideuteroacetaldehyde. |
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Answer» Correct Answer - A::B::D As benzaldehyde has no `alpha`-hydrogen atom, it does not undergo aldol condensation. |
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| 279. |
A compound that shows positive iodoform test isA. Pentan-1-olB. Pentan-2-oneC. Pentan-3-oneD. Pentanal. |
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Answer» Correct Answer - B `{:(underset("Pentan-1-ol")(CH_(3)[CH_(2)]_(4)OH)" "underset("Pentan-2-one")(CH_(3)COCH_(2)CH_(2)CH_(3))),(underset("Pentan-3-one")(CH_(3)CH_(2)COCH_(2)CH_(3))" "underset("Pentanal")(CH_(3)[CH_(2)]_(3)CHO)):}` Only pentan-2-one with `CH_(3)CO-` group will give iodoform test. |
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| 280. |
The number of isomeric ketones with formula `C_(6)H_(12)O` areA. 6B. 2C. 5D. 4 |
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Answer» Correct Answer - A Isomeric ketones (six) are (1) Hexan-2-one (2) Hexan-3-one (3) 3-Methyl-2-pentanone (4) 4-Methyl-2-pentanone (5) 2-Methyl-3-pentanone (6) 3,3-Dimethyl-2-pentanone. |
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| 281. |
Select the incorrectly matched options :A. `R-CO-CH_(3)overset(Zn//Hg)underset(conc.HCl)rarrR-CH_(2)-CH_(3)` (Clemmensen reduction)B. C. `R-CHO+N_(3)Hunderset((330-341K))overset(conc.H_(2)SO_(4))rarrR-CN+RNHCO+N_(2)` (Schmidt reaction)D. `BrCH_(2)COOC_(2)H_(5)+Znoverset("Dry ether")rarrBrZn-CH_(2)COOC_(2)H_(5)` (Perkin reaction ) |
| Answer» Correct Answer - B | |
| 282. |
Chloretone belongs to which of the following category?A. Simple aldehydeB. `beta`-Chloro ketoneC. `beta`-Chloro esterD. Trichloro alcohol. |
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Answer» Correct Answer - D Chloretone `{:(" CH"_(3)),(" |"),(CH_(3)-C-OH),(" |"),(" CCl"_(3)):}` is a trichloro alcohol. |
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| 283. |
A substance X containing three carbon atoms gives white crystalline precipitate with sodium sulphite but does not give red precipitate with Fehling solution. On treatment with `NH_(2)-NH_(2)//KOH`, X wil yieldA. PropeneB. PropaneC. CyclopropaneD. Propionic acid. |
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Answer» Correct Answer - B `underset((X))(CH_(3)COCH_(3))overset(NH_(2)-NH_(2))underset(NaOH)rarrunderset("Propane")(CH_(3)CH_(2)CH_(3)+H_(2)O)` |
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| 284. |
Which of the following does not give brick red ppt. with Fehling solution ?A. FormalinB. AcetaldehydeC. D-glucoseD. Acetone. |
| Answer» Correct Answer - D | |
| 285. |
Which of the following will not reduce Fehling solution ?A. `CH_(3)CH_(2)CHO`B. `CH_(3)COCH_(3)`C. `CH_(3)CHO`D. `C_(6)H_(5)CH_(2)CHO`. |
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Answer» Correct Answer - B `H_(3)"CC"OCH_(3)`. |
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| 286. |
Which of the following will be most readily dehydrated in acidic conditions ?A. B. C. D. |
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Answer» Correct Answer - A Oppanauer oxidation of a `2^(@)` alcohol (pentan-3-ol) gives a ketone (pentan-3-one) |
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| 287. |
Which of the following would undergoe aldol condensation?A. `CH_(3)CHO`B. `C Cl_(3)CHO`C. CHCHOD. `(CH_(3))_(3)C CHO` |
| Answer» Correct Answer - A | |
| 288. |
Which of the following pairs can be distinguished by sodium hypoiodite?A. `CH_(3)CHO and CH_(3)COCH_(3)`B. `CH_(3)CH(2)CHO and CH_(3)COCH_(3)`C. `CH_(3)CH_(2)OH and CH_(3)CH_(2)CHOHCH_(3)`D. `CH_(3)OH and CH_(3)CH_(2)CHO` |
| Answer» Correct Answer - B | |
| 289. |
Which of the following reagents can give urotopine?A. Ethanal and EthylamineB. Methanal and `H_(2)SO_(4)`C. Methanal and ammoniaD. Methanal and `50%` NaOH. |
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Answer» Correct Answer - C `underset("Methanal")(6HCHO)+underset("Ammonia")(4NH_(3))rarrunderset("Urotropine")((CH_(2))_(6)N_(4))+6H_(2)O` |
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| 290. |
Aldol isA. `beta`-hydroxybutyraldehydeB. `alpha`-hydroxybutanalC. `beta`-hydroxypropanalD. None of above. |
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Answer» Correct Answer - A Aldol is `underset"or (3-Hydroxybutanal)"underset(beta-"hydroxybutyraldehyde")(CH_(3)-overset(OH)overset("| ")("CH")-CH_(2)CHO)` |
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| 291. |
Formalin is an aqueous solution ofA. FurfuralB. FluoresceinC. FormaldehydeD. Formic acid. |
| Answer» `40%` Aqueous solution of Formaldehyde is called as Formalin. | |
| 292. |
Formalin is:A. liquid formaldehydeB. `40%` solution of formaldehyde in waterC. `40%` solution of formaldehyde in acetoneD. `40%` solution of formaldehyde in acetaldehyde |
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Answer» Correct Answer - B Factual question. |
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| 293. |
Formalin is an aqueous solution ofA. fluoresceinB. Formic acidC. formaldehydeD. furfuraldehdye |
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Answer» Correct Answer - C The 40% solution of formaldehyde in water is sold in market under the name of formalin formaldehyde in the form of formalin (40% formaldehyde, 8% methanol and 52% water) is used for preserving biological specimens. Formaline solution also used as a disinfectants and commonly used in hardness and nail varnish. |
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| 294. |
If formaldehyde and `KOH` are heated, then we getA. methaneB. methyl alcoholC. ethyl formateD. acetylene |
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Answer» Correct Answer - B When `alpha`-hydrogen is absent in carbo nyl group, those compound gives cannizaro reaction. This reaction show disproportionation the oxidation product is salt of carboxylic acid and reduced product is alcohol `HCHO+HCHOoverset("KOH (conc.)")tounderset("Methyl alcohol")(CH_(3)OH)+HCOO^(-)K^(+)` |
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| 295. |
In baklite, the rings, are joined to each other through:A. `-CH_(2)-`B. `-O-`C. `-underset(H)underset(|)overset(OH)overset(|)C-H`D. `-overset(O)overset(||)C-` |
| Answer» Correct Answer - A | |
| 296. |
Urotropine is formed by the action of ammonia on:A. acetaldehydeB. formaldehydeC. acetoneD. phenol |
| Answer» Correct Answer - B | |
| 297. |
The composition of urotropine is :A. `(CH_(2))_(4)N_(6)`B. `(CH_(2))_(5)N_(5)`C. `(CH_(2))_(6)N_(6)`D. `(CH_(2))_(6)N_(4)` |
| Answer» Correct Answer - D | |
| 298. |
In the compound `CH_(3)CH_(2)COCH_(3)`, the number of hydrogen atoms taking part in aldol condensation is : |
| Answer» There are five `alpha`-hydrogen atom present which can take part in Aldol condensation. | |
| 299. |
Total number of nitrogen atoms present in urotropine is : |
| Answer» The formula of urotropine is `(CH_(2))_(6)N_(4)`. | |
| 300. |
Reaction of acetaldehyde with `NH_(2)OH` will be fastest at which of the following pH?A. 1B. 7C. 8D. 6 |
| Answer» Correct Answer - D | |