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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.
| 201. |
X isA. B. C. D. |
| Answer» Correct Answer - A | |
| 202. |
The end product (Z) of the following reaction is |
| Answer» Correct Answer - D | |
| 203. |
Match the following: A B(1) C6H5N2+Cl- + Cu + HCli. Coupling Reaction(2) C6H5N2+Cl- + C6H5OHii. Hinsberg's test(3) CH3NH2 + KOH + CHCl3iii. Hofmann's bromamide(4) C6H5N2+Cl- + CuBr + HBriv. Sandmeyer's Reaction(5) CH3NH2 + C6H5SO2Clv. Gatterman Reaction(6) CH3CONH2 + KOH + Br2vi. Isocyanide test |
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| 204. |
Benzenediazonium chloride is reduced to benzene byA. WaterB. Hypophosphorous acidC. Hypophosphoric acidD. Phosphine |
| Answer» Correct Answer - B | |
| 205. |
Which of the following reagents can be used to convert benzenediazonium chloride into benzene ?A. `CH_(3)OH`B. `H_(3)PO_(2)`C. `Br_(2)//H(2)O`D. `LiAiH_(4)` |
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Answer» Correct Answer - B Hypophophorus acid (phosphinic acid) `H_(3)PO_(2)` reduces diazonium salts to arenes and gets oxidized to phosphoric acid `ArN_(2)^(+)Cl^(bar)+H_(3)Po_(2)+H_(2)Orarr ArH + N_(2)+H_(3)PO_(3)+HCI` Since benzenediazonium salts are synthesized in aqueous solution `LiAIH_(4)` can t be used for reduction as t reacts vigorously with water . |
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| 206. |
Why is benzene diazonium chloride not stored and is used immediately after its preparation? |
| Answer» Benzenediazonium chloride is unstable. Therefore, it cannot be stored, instead it is used immediately after its preparation. | |
| 207. |
Which of the following amines can be prepared by Gabriel synthesis.(i) Isobutyl amine(ii) 2-Phenylethylamine(iii) N-methylbenzylamine(iv) Aniline |
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Answer» (i), (ii) (i) Isobutyl amine |
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| 208. |
Which of the following species are involved in the carbylamine test?(i) R—NC(ii) CHCl3(iii) COCl2(iv) NaNO2 + HCl |
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Answer» (i), (ii) (i) R—NC (ii) CHCl3 |
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| 209. |
Reduction of nitrobenzene by which of the following reagent gives aniline?(i) Sn/HCl(ii) Fe/HCl(iii) H2-Pd(iv) Sn/NH4OH |
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Answer» (i), (ii), (iii) (i) Sn/HCl (ii) Fe/HCl (iii) H2-Pd |
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| 210. |
Arenium ion involved in the bromination of aniline is __________. |
| Answer» (i), (ii), (iii) | |
| 211. |
The product of the following reaction is __________. |
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Answer» The correct option is (i), (ii) |
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| 212. |
Which of the following is not the characteristic of sulphanilic acid . (A) High melting point (B) Soluble in aqueous HCI (C ) Insoluble in `H_(2)O` and organic solvents (D) Insoluble in aqueous `NaOH` .A. A,DB. B,DC. C,DD. B,C |
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Answer» Correct Answer - B Sulphailic acid has a dipolar ion (or zwitter ion) structure Being ionic it has a high melting point and structure Being ionic it has a high melting point and insoluble in `H_(2)O` as well as organic solvents As long as it exists as a dipolar ion which imarts high lattice enthalpy it will be insoluble in any given medium Thus it is insoluble in aqueous `HCI` because `-SObar_(3)` is too weakly basic to accep `H^(+)` from strong acids However it is soluble in aqueous `NaOH` because the weakly acidic `NH_(3)` transfers `H^(+)` to `OHbar` and destroys the dipolar ion to yield a simple ion `p-H_(2)NC_(6)H_(5)SObar_(3)` which imparts low lattice enthalpy . |
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| 213. |
Account for the following :(a) CH3CHO is more reactive than CH3COCH3 towards reaction with HCN.(b) 2-Fluorobutanoic acid is a stronger acid than 3-Fluorobutanoic acid. |
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Answer» (a) Steric and electronic factor. (b) Inductive effect decreases with distance and hence the conjugate base of 2-Fluorobutanoic acid is more stable. |
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| 214. |
Identify the end product in the reaction A. B. C. D. |
| Answer» Correct Answer - A | |
| 215. |
`-NH_(2)` group is a strong activator towards aromatic electrophilic substiution reaction. Activating capability of `-NH_(2)` group can be reduced by treating withA. `CH_(3)I`B. `CH_(3)overset(O)overset(|)C-Cl`C. `CH_(3)-NH_(2)`D. `CH_(3)-overset(O)overset(||)C-O-overset(O)overset(||)C-CH_(3)` |
| Answer» Correct Answer - B::D | |
| 216. |
Name the reaction in which a primary amine is formed from amide. |
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Answer» Hoffmann bromamide degradation. |
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| 217. |
What is Hinsberg’s reagent? |
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Answer» Benzenesulphonyl chloride (C6H5SO2Cl) is known as Hinsberg’s reagent. |
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| 218. |
Which of the following does not react with benzy1 chloride ?A. B. C. D. |
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Answer» Correct Answer - D It is a tertiary amine It fails to react with benzoy1 chloride because it amine the presence of a base either aqueous sodium hydroxide or pyridine |
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| 219. |
Which of the following does not undergo diazotization reaction?A. B. C. D. |
| Answer» Correct Answer - B::D | |
| 220. |
Write the order of basicity of aliphatic alkylamine in gaseous phase. |
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Answer» The order of basicity of aliphatic alkyl amines in the gaseous follows the order : tertiary amine > secondary amine > primary amine > NH3. |
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| 221. |
Nitromethane on reaction with H2 /Pd gives ...... |
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Answer» Ethanamine (CH3CH2NH2) |
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| 222. |
Which of the following species are involvedA. `R-NC`B. `CHCl_(3)`C. `COCl_(2)`D. `NaNO_(2)+HCl` |
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Answer» Correct Answer - A::B Carbylamine reaction Amine on reaction with a mixture of `CHuCl_(3)` and `KOH` produces alkyl isocynate `R-NH_(2)+CHCl_(3)+3KOH to RNC+3KCl+3H_(2)O` Only RNC and `CHCl_(3)` are involved in carbylamine reaction. Hence(a) and (b) are correct. |
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| 223. |
The compound C is:A. B. C. D. |
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Answer» Correct Answer - B |
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| 224. |
The compound B is:A. B. C. D. |
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Answer» Correct Answer - D |
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| 225. |
Consider the following sequence of reactions: Identify product C:A. B. C. D. |
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Answer» Correct Answer - C |
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| 226. |
Identify the final product of following reaction: A. B. C. D. |
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Answer» Correct Answer - B |
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| 227. |
The product can be given as:A. B. C. D. |
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Answer» Correct Answer - D |
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| 228. |
In a set of reactions acid yielded a compound D. The strucuture of D would be :A. B. C. D. |
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Answer» Correct Answer - B |
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| 229. |
The major product formed in the reaction is: A. B. `H_(3)C-CH=CD_(2)`C. `H_(2)C =CH-CD_(3)`D. `H_(2)C=N-CH_(3)` |
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Answer» Correct Answer - C |
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| 230. |
Consider the following sequence of reaction: The final product is:A. B. C. D. |
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Answer» Correct Answer - B |
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| 231. |
The product formed in the reaction is : A. B. C. D. |
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Answer» Correct Answer - B |
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| 232. |
What would be the final product of reaction? A. B. C. D. |
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Answer» Correct Answer - A |
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| 233. |
The final product (B) is:A. B. C. D. |
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Answer» Correct Answer - A |
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| 234. |
The final major product of the reaction is: `Ph-overset(OH)overset(|)underset(Ph)underset(|)(C)-underset(" "NH_(2))underset(|)(CH)-CH_(3)overset(NaNO_(2)+HCI)rarr`A. `Ph-overset(OH)overset(|)underset(Ph)underset(|)(C)-overset(O)overset(||)(C)-CH_(3)`B. C. D. `Ph-overset(" "OH)overset(|)underset(Ph)underset(|)(C)-overset(" "OH)overset(|)underset(" "CH_(3))underset(|)(C)-CH_(3)` |
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Answer» Correct Answer - C |
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| 235. |
The number of coordinate bond/bonds in a trialkyl ammonium ion is :(a) one (b) two (c) three (d) four |
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Answer» Option : (a) one |
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| 236. |
In Which of the following compound are intermolecular hydrogen bonds not formed among its molecules .A. `CH_(3)CH_(2)NH_(2)`B. `(CH_(3)CH_(2))_(2)NH`C. `(CH_(3)CH_(2))_(3)N`D. Both (2) and (3) |
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Answer» Correct Answer - C Primary and secondary amines are engaged in intermolecular association due to hydrogen of another molecule This intermolecular association is more in primary amines than in secondary amines as there are two H atoms available for hydrogen bond formation in it Tertiary amines do not have intermolecular association due to the absence of hydrogen atom available for hydrogen bond formation . |
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| 237. |
Which of the following is a gas at room temperature ? `CH_(3)NH_(2)` (ii) `CH_(3)CH_(2)NH_(2)` (iii) `(CH_(3))_(2)` (iv) `(CH_(3))_(3)N`A. (i)B. (i),(ii)C. (i),(ii),(iii)D. (i),(ii),(iii),(iv) |
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Answer» Correct Answer - D The lower members (of all the three types of amines) are gases These are followed by members which are liquids and finally by members which are solids . |
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| 238. |
To prepare quaternary ammonium compounds we heat _____ with a large excess of alky1 halide .A. ammoniaB. primary amineC. secondary amineD. any of these |
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Answer» Correct Answer - D `NH_(3)+4RXoverset(Delta)rarrR_(4)overset(+)NX+ 3HX` `RNH_(2)+3RXoverset(Delta)rarrR_(4)overset(+)NX+2HX` `R_(2)NH+2RXoverset(Delta)rarrR_(4)overset(+)NX+HX` We can also use a tertiary amine to yield a quaternary compound For example ethyltrimethylammonium iodide can be prepared by heating trimethylamine with ethy1 iodide `(CH_(3))_(3)N+C_(2)H_(5)I overset(Delta)rarr(CH_(3))_(3)overset(+)NC_(2)H_(5)Ibar` . |
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| 239. |
Give one application of quaternary ammonium salts. |
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Answer» Quaternary ammonium salts of long chain carbon atoms are used in detergents [CH2(CH2)15N(CH3)2]+ Cl- |
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| 240. |
Which of the following statemnets is true ?A. Triehtylamine forms a soluble compound with Hinsberg reagent and `KOH` .B. Dimethyamine reacts with `KOH` and pheno1 to form an azodye .C. Methylamine reacts with nitrous acid and liberates `N_(2)` from aqueous solution .D. None of these |
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Answer» Correct Answer - C `underset("Methylamine")(CH_(3)NH_(2))+HONOrarrCH_(3)OH+underset("Nitrogen")(N_(2)+H_(2)O` Trimethylamine `[(CH_(3))_(3)N]` does not react with `C_(6)H_(5)SO_(2)CI` as there is no hydrogen on `N` atom Dimethylamine can t form an azodye as it falis to form a diazonium ion . |
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| 241. |
Which of the following quaternary ammonium hydroxides undergoes Saytzeff s elimination ? `A[CH_(3)CH_(2)underset(Me)underset(|)overset(Me)overset(|)NCH_(2)CH_(2)CH_(3)]^(+)Ohbar` ` B[CH_(3)CH_(2)CH_(2)underset(CH_(3))underset(|)(CHNMe_(3))]^(+)OHbar` `C[PhCH_(2)CH_(2)underset(Me)underset(|)overset(Me)overset(|)NCHMe_(3)]^(+)OHbar` `D[CH_(3)CH_(2)-underset(Me)underset(|)overset(Me)overset(|)N-C(CH_(3))_(2)]^(+)OHbar` .A. A,BB. C,DC. B,CD. A,D |
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Answer» Correct Answer - B In `C` the saytzeff product `PhCH = CH_(2)` and not the Hofmann product `H_(2)C =CH_(2)` is formed The greatly increased acidity of the benzylic `betaH` and the stability of the conjugated alkene influence the course of the reaction Thermal decomposition of `(D)` yield `(CH_(3))_(2)C=CH_(2+)+ EtNMe_(2) (93%)` and `CH_(2)=CH_(2)+t-BuNMe_(2)(7%)` This result is Saytzeff not Hofmann product There are two types of primary `(1^(@)) beta` hydrogen atoms one on `CH_(3)CH_(2)` and the t-Bu group is favoured statistically (nine from `C(CH_(3))_(3)` vs three from `CH_(3)CH_(2)`) and also because a more stable alkene is formed . |
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| 242. |
The thermal decomposition of the hydroxide salt of `Ph overset(+)NM e_(3)` gives .A. `CH_(3)OH`B. `C_(6)H_(5)OH`C. `C_(6)H_(5)CH_(2)OH`D. `CH_(3)CH_(2)OH` |
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Answer» Correct Answer - A `[Phoverset(+)NMe_(3)]ObarH overset(Delta)rarrPhNMe_(2)+CH_(3)OH` Lacking a betaH,` ObarH` displaces on Me to give `MeOH` and `PhNMe_(2)` . |
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| 243. |
The decomposition of organic compounds, in the presence of oxygen and without the development of odoriferous ssubstances, is calledA. decayB. `N_(2)`-fixationC. nitrificationD. denitrification |
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Answer» Correct Answer - A Decomposition of organic compounds in the presence of oxygen is generally called decay. The remaining three reactions takes place in the presence of bacteria. |
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| 244. |
The raction `C_(6)H_(5)overset(+)H_(2) barC1 overset(CuCi//HCI)rarr C_(6)H_(5)CI+N_(2)` is an example of .A. Gattermann reactionB. Bart reactionC. diazotisationD. Sandmeyer reaction . |
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Answer» Correct Answer - D In Sandmeyer reaction arendiazonium salts react with cuprous halides [CuCI or CuBr] to give products in which the diazonium group is replaced by halogen [Cl or Br] . |
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| 245. |
In the Hofmann-Bromamide rearrangement intermediate compounds are:A. `R -CONHBr`B. `[R-overset(O)overset(||)(C)-bar(N) -Br]Na^(+)`C. `R -N=C=O`D. all of these |
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Answer» Correct Answer - D |
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| 246. |
Which of the following amines yields foul smelling product with haloform and alcoholic KOH?(a) Ethyl amine(b) Diethyl amine (c) Triethyl amine (d) Ethyl methyl amine |
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Answer» Option : (a) Ethyl amine |
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| 247. |
The most reactive amine towards dilute hydrochloric acid is ___________. |
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Answer» The correct answer is (ii) |
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| 248. |
Which of the following will not react with sodiumnitrite and HCl?A. B. C. D. |
| Answer» Correct Answer - D | |
| 249. |
Cyclobutyl amine is treated with sodiumnitrite and aqueous HCl. The products formed areA. B. C. D. |
| Answer» Correct Answer - A::B::D | |
| 250. |
Which type of amine does produce N when treated with HNO ? a. Primary amine b. Secondary amine c. Tertiary amine d. Both primary and secondary amines |
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Answer» Correct answer is a. Primary amine |
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