361 + Interview Questions in AMINES IN GENERAL AWARENESS Page 6 InterviewSolution

251.	Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.(i) Aniline(ii) Phenol(iii) Anisole(iv) Nitrobenzene
Answer» (iv) Nitrobenzene

Discussion

252.	Among the following amines, the strongest Brönsted base is __________.
Answer» The correct answer is (iv)

Discussion

253.	Which of the following compounds is the weakest Brönsted base?
Answer» The correct answer is (iii)

Discussion

254.	During the reduction of nitro compound to an amine the oxidation number of nitrogen changes byA. six unitsB. five unitsC. four unitsD. three units
Answer» Correct Answer - A `Ar-overset(+3)(N)overset(H_(2)" Catalyst")underset(underset((2)OH^(-))(or(1)F,HCl))rarrAr-overset(-3)(N)H_(2)` Overall, this is a `6ebar` rediuction as the oxidation number of N changes `+3` to `-3`

Discussion

255.	Arenediazonium ion are weak electrophiles, they react with highly reactive aromatic compounds with phenols and tertiary aryl amines to yeild azo compounds. This electrophilic substitution is often called a diazo coupling reaction. What is the major product of given reaction? A. Balz Schiemenn reactionB. Gattermann reactionC. Carbylamines reactionD. Diazotization reaction
Answer» Correct Answer - D

Discussion

256.	Arenediazonium ion are weak electrophiles, they react with highly reactive aromatic compounds with phenols and tertiary aryl amines to yeild azo compounds. This electrophilic substitution is often called a diazo coupling reaction. What is the major product of given reaction? The product (P) isA. B. C. D.
Answer» Correct Answer - A

Discussion

257.	Which of the following is the weakest Brönsted base?
Answer» The correct answer is (i)

Discussion

258.	Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?(i) H2 (excess)/Pt(ii) LiAlH4 in ether(iii) Fe and HCl(iv) Sn and HCl
Answer» (ii) LiAlH₄ in ether

Discussion

259.	Benzylamine may be alkylated as shown in the following equation :C6H5CH2NH2 + R—X → C6H5CH2NHRWhich of the following alkylhalides is best suited for this reaction through SN1 mechanism?(i) CH3Br(ii) C6H5Br(iii) C6H5CH2Br(iv) C2H5 Br
Answer» (iii) C₆H₅CH₂Br

Discussion

260.	Statement -1: Tertiary amines have lower boiling point than secondary amine. and Statement-2: Hydrogen bonding is often responsible for increases in boiling point.A. Statement-1 is true, Statement-2 is true, statement-2 is a correct explanation for statement-8B. Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-8C. Statement-1 is true, statement-2 is FalseD. Statement-1 is False, Statement-2 is True.
Answer» Correct Answer - A

Discussion

261.	A mixture containing primary, secondary and tertiary amine is treated with diethyl oxalate. Choose the correct statementA. The distillate of the mixture after treatment mainly contains `1^(2)` amine.B. `3^(@)` amine do not react with diethyl oxalateC. This is Hinsberg method of separating `1^(@), 2^(@)` & `3^(@)` amines.D. `3^(@)` amine is removed by filtration
Answer» Correct Answer - B

Discussion

262.	Incorrect statement among the following isA. `-NO_(2)` is a deactivating groupB. Causes the substitution to occur at meta-positionC. Nucleophilic ring substitution in nitrobenzene occurs at ortho and para positionD. Hydrolysis of picryl chloride requires higher temperature than chlorobenzene.
Answer» Correct Answer - D

Discussion

263.	For carbylamine reaction, we need hot alc. KOH andA. any primary amine and chloroformB. chloroform and silver powderC. a primary amine and an alkyl halideD. a mono alkyl amine and trichloromethane
Answer» Correct Answer - A Aliphatic and aromatic primary amines when warmed with chloroform and an alcoholic solution of KOH, form isocyanide or carbylamine which has very unpleasant smell. `CH_(3)CH_(2)NH_(2)+CHCl_(3)+3KOH overset("Warm")to CH_(3)CH_(2)NC+3KCl+3H_(2)O`

Discussion

264.	Indicate which nitrogen compund amongst the following would undergo Hofimann reaction ? .A. `RCONHCH_(3)`B. `RCO ONH_(4)`C. `RCONH_(4)`D. `RCONHOH`
Answer» Correct Answer - C When amides react with bromine in the presence of caustic alkali to form a primary amine carrying one carbon atom less than the parent amide, then the reaction is known as Hofmann bromamide reaction. `RCONH_(2)+Br_(2)+4KOH overset("Heat")to RNH_(2)+K_(2)CO_(3)+2KBr+2H_(2)O`

Discussion

265.	Write IUPAC name of
Answer» 4 - Methoxy benzene amine.

Discussion

266.	Of the following amines how many can give carbyl amine reaction?
Answer» Correct Answer - 3

Discussion

267.	Of the following reactions, how many reaction, are used for the preparation of amines? (a) `R-C-=N overset(LiAIh_(4))rarr` (b) `R-overset(O)overset(\|\|)(C)-NH_(2)overset(LiAIH_(4))rarr` (c) `R-overset(O)overset(\|)(C)-NH_(2) overset(Br_(2)+overset(Theta)(OH))rarr` (d) `R-overset(O)overset(\|\|)(C)-CH_(3)+H_(3)C-NO_(2)overset(NaOH)rarr` (g) `R-overset(O)overset(\|\|)(C)-NH_(2)overset(P_(2)O_(5))underset(D)rarr` (h) `R-CH_(2)-NO_(2) overset(H_(2),Ni)rarr`
Answer» Correct Answer - 5

Discussion

268.	Which of the following give L Liebermann nitroso reaction?A. B. C. D.
Answer» Correct Answer - A::B

Discussion

269.	A nitrile X is treated with `LiAIH_(4)` to obtain compound `Y(C_(2)H_(7)N)`. In a separate reaction X is hydrolysed in an acid medium to obtain Z. The product obtained after mixing Y and Z will be :A. `CH_(3)CONCH_(2)CH_(3)`B. `CH_(3)CH_(2)CONHCH_(2)CH_(3)`C. `(CH_(3)COO^(-)(CH_(3)CH_(2)NH_(3)^(+))`D. `(CH_(3)CH_(2)COO^(-))(CH_(3)NH_(2)^(+))`
Answer» Correct Answer - C

Discussion

270.	Consider the structures: Which of the following statements are correct?A. Basic stength of II is greater than IB. Basic strength of II is less than that of IC. Basic strength of IV is greater than IIID. Basic strength of IV is less than that of III
Answer» Correct Answer - A::C

Discussion

271.	What is the overall structure of diazepam?A. B. C. D.
Answer» Correct Answer - C

Discussion

272.	Following is an outline for the synthesis of diazepam. A commonly used tranquilizer. The structure of [R] would beA. B. C. D.
Answer» Correct Answer - B

Discussion

273.	Following is an outline for the synthesis of diazepam. A commonly used tranquilizer. The reagent [X] in the reaction could beA. `LiAlH_(4)`B. `NaBH_(4)`C. `OH^-//H_(2)O`D. `AlCl_(3)`
Answer» Correct Answer - C

Discussion

274.	Match the following :
Answer» A(p,q,s), B(p,q,s), C(p,q,s,t), D( r)

Discussion

275.	In which of the following reaction cyanide will be obtained as a major product?A. `Ph-overset(O)overset(\|\|)C-CH_(3)overset((i) LiAlH_(4))underset((ii) H_(3)O)to`B. `Ph-overset(O)overset(\|\|)C-NH_(2)overset(NaOH)underset(Br_(2))to`C. `Ph-overset(O)overset(\|\|)C-NH_(2)overset(P_(4)O_(10))to`D. `Ph-overset(O)overset(\|\|)C-O-H overset(SOCl_(2))tooverset(NH_(3))to`
Answer» Correct Answer - C `Ph-overset(O)overset(\|\|)C-NH_(2)overset(P_(4)O_(10))underset(dehydration)toPh-C-=N`

Discussion

276.	The major product obtained in the reaction is A. B. C. D.
Answer» ( c) Hofmann elimination

Discussion

277.	The gas evolved when methylamine reacts with nitrous acid is….A. `NH_(3)`B. `N_(2)`C. `H_(2)`D. `C_(2)H_(6)`
Answer» Correct Answer - B

Discussion

278.	The gas evolved when methylamine reacts with nitrous acid is __________.(i) NH3(ii) N2(iii) H2(iv) C2H6
Answer» The gas evolved when methylamine reacts with nitrous acid is N_2^.

Discussion

279.	Consider the nitratio of benzene using mixed conc. `H_(2)SO_(4)` and `HNO_(3)`. If a large amount of `KHSO_(4)` is added to the mixture, the rate of nitration will be `:`A. slowerB. unchangedC. doubledD. faster
Answer» Correct Answer - A In the nitration of benzene in the presence of conc. `H_(2)SO_(4) " and" HNO_(3)`, nitrobenzene is formed. `HNO_(3)+H_(2)SO_(4) hArr NO_(2)^(+) + underset("Electrophile")(HSO_(4)^(-))+underset("Nucleophile")(H_(2)O)` If large amount of `KHSO_(4)` is added to this mixture, more `HSO_(4)^(-)` ion furnishes and hence the concentration of `NO_(2)^(+)`, i.e., electrophile decreases. As concentration of electrophile decreases, rate of electrophilic aromatic reaction also decreases.

Discussion

280.	Arrange the following in decreasing order of their basic strength: C6H5NH2, C2H5 NH2, (C2H5)2NH, NH3
Answer» The decreasing order of basic strength of the above amines and ammonia follows the following order: (C₂H₅)₂NH > C₂H₅ NH₂ > NH₃ > C₆H₅NH₂

280.

Arrange the following in decreasing order of their basic strength: C6H5NH2, C2H5 NH2, (C2H5)2NH, NH3

Answer»

The decreasing order of basic strength of the above amines and ammonia follows the following order:

(C₂H₅)₂NH > C₂H₅ NH₂ > NH₃ > C₆H₅NH₂

Discussion

281.	Arrange the following compounds in the increasing order of their basic strength in aqueous solution. NH3, RNH2, R2NH,R3N (R=C2H5)
Answer» NH₃< RNH₂ < R₃N < R₂NH

Discussion

282.	What is the decreasing order of basicity of `1^(@)2^(@)` and `3^(@)` ethy1 amines and ammonia ?A. `(C_(2)H_(5))_(2)NH gt C_(2)H_(5)NH_(2) gt (C_(2)H_(5))_(3)N gt NH_(3)`B. `(C_(2)H_(3))N gt (C_(2)H_(5))_(2)NH gt C_(2)H_(5)NH_(2) gt NH_(3)`C. `(C_(2)H_(2))_(2)NH gt (C_(2)H_(5))_(3)N gt C_(2)H_(5)NH_(2) gt NH_(3)`D. `NH_(3) gt C_(2)H_(5)NH_(2) gt (C_(2)H_(5))_(2)NH gt (C_(2)H_(5))_(3)N`
Answer» Correct Answer - C In aq. Solution two factors operate simultaneously (i) inductive effect of alkyl group which tends to increase the basic strength and (ii) steric effect of alkyl group which tends to decrease the basic strength The combined effect of the two results in the following order `NH_(3) lt C_(2)H_(5)NH_(2) lt (C_(2)H_(5))_(3)N lt (C_(2)H_(5))_(2)NH` .

Discussion

283.	In the given reaction sequence `C_(6)H_(5)-CH_(2)-NH_(2) overset(CHCl_(3)//Alc.KOH)underset(Delta)rarr [X] overset(H_(2)O //NaOH)rarr [Y],[Y]` will be:A. `C_(6)H_(5)-CN`B. `C_(6)H_(5)NC`C. `C_(6)H_(5)-CH_(2)-NH_(2)`D. `C_(6)H_(5)-CH_(2)OH`
Answer» Correct Answer - C

Discussion

284.	Explain why `MeNH_(2)` is stronger base than `MeOH`?
Answer» Basicity of `MeNH_(2)` and MeOH can be explained on their basis of electronegativity of N and O atom. `MeNH_(2)` is stronger base than MeOH because of low electronegativity value of N, it is easy for nitrogen to loose its lone pair readily than compared to MeOH.

Discussion

285.	The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating amide is known as Hofmann-Bromoamide reaction. `R-overset(O)overset(\|\|)(C)-NH_(2) overset(Br_(2)+NaOH)underset(or NaOBr)rarr R-NH_(2)+NaBr +Na_(2)CO_(3)` Mechanism: A. B. C. D. all of these
Answer» Correct Answer - A

Discussion

286.	The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating amide is known as Hofmann-Bromoamide reaction. `R-overset(O)overset(\|\|)(C)-NH_(2) overset(Br_(2)+NaOH)underset(or NaOBr)rarr R-NH_(2)+NaBr +Na_(2)CO_(3)` Mechanism: Number of moles of `NaOH` consumed in above reaction:A. 1B. 2C. 3D. 4
Answer» Correct Answer - D

Discussion

287.	Choose the correct comparisons of basicity:A. B. C. D.
Answer» Correct Answer - A::B::C

Discussion

288.	Which of the following order of basicity is correct in aqueous medium?A. `(CH_(3))_(2)NH gt (CH_(3))_(3)N gt CH_(3)NH_(2)`B. `(CH_(3))_(2)NH gt CH_(3)NH_(2) gt (CH_(3))_(3)N`C. `(C_(2)H_(5))_(2)NH gt (C_(2)H_(5))_(3)N gt C_(2)H_(5)NH_(2)`D. `(C_(2)H_(5))_(2)NH gt C_(2)H_(5)NH_(2) gt (C_(2)H_(5))_(3)N`
Answer» Correct Answer - B::C

Discussion

289.	The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating amide is known as Hofmann-Bromoamide reaction. `R-overset(O)overset(\|\|)(C)-NH_(2) overset(Br_(2)+NaOH)underset(or NaOBr)rarr R-NH_(2)+NaBr +Na_(2)CO_(3)` Mechanism: Find X and Y:A. B. C. D.
Answer» Correct Answer - B

Discussion

290.	`CH_(3)CH_(2)NH_(2) overset((CH_(3)CO)_(2))underset(Delta) to A+B`, (A) and (B) areA. `CH_(3)CH_(2)NHCOCH_(2) + CH_(3)CH_(2)N-=C`B. `CH_(3)CH_(2)NO_(2) + CH_(3)COOH`C. `CH_(3)CH_(2)NHCOCH_(3)+CH_(3)COOH`D. `CH_(3)CH_(2)NO_(2)+CH_(3)CH_(2)NHCOCH_(3)`
Answer» Correct Answer - C

Discussion

291.	If `pK_(b)` for the reaction of `MeNH_(2)` in water is `3.4` the `pK_(a)` for the conjugate acid `Meoverset(+)NH_(3)` will the .A. `14//3.4`B. `14+3.4`C. `(14)(3.4)`D. `14-3.4`
Answer» Correct Answer - D Because `pK_(a)+pK_(b)=pK_(w)=14 (at 25^(@)C)` .

Discussion

292.	Which of the following iscorrect ? (a) the conjugate acid of `HO(CH_(2))_(3)NH_(2)` is `H_(2)overset(+)O(CH_(2))_(3)NH_(2)` is (b) The conjugate base of `HO(CH_(2))_(3)NH_(2)` is `barO (CH_(2))_(3)overset(+)underset(+)(N)H_(2)` (C ) The conjugate acid of `HO(CH_(2))_(3)NH_(2)` is `HO(CH_(2))_(3)NH_(2)` (d) The conjugate base of `HO(CH_(2))_(3)NH` .A. (b),(C )B. (a),(b)C. (c ),(d)D. (a),(d)
Answer» Correct Answer - A Conjugate acid `hArr H^(+)` + conjugate base The conjugate acid of `HO(CH_(2))_(3)NH_(2)` is `HO(CH_(2))_(3) overset(+)NH_(3)` because `NH_(2)` is a more basic site than `oH` The conjugate base of `HO(CH_(2))` is `barO(CH_(2))_(3) NH_(2)` because `H-O` is more acidic than `H-N` .

Discussion

293.	Give a simple chemical test to distinguish between the following pair of compounds : C6H5 - NH2 and C6H5 - NH - CH3
Answer» Add CHCI₃ and alc. KOH,C₆H₅ - NH₂ gives foul smell of isocyanide whereas C₆H₅ - NH - CH₃ does not.

Discussion

294.	Identify the compound 'B' in the following series of reactions :Ethanenitrile \(\overset{Na/alcohol}{\longrightarrow}\) 'A' \(\overset{NaNO_2/dil.HCI}{\longrightarrow}\) 'B'(a) CH3-CH2-Cl(b) CH3-CH2-NH2(c) CH3-CH2-OH(d) CH3-CH2-CH2-OH
Answer» Option : (c) CH₃-CH₂-OH

Discussion

295.	Triethylamine when treated with nitrous acid gives :(a) an alcohol (b) a nitrosamine (c) a monoacetyl derivative (d) a soluble nitrite salt
Answer» Option : (d) a soluble nitrite salt

Discussion

296.	Which of the following does not reduce Tollens reagent .A. `CH_(3)CHO`B. `C_(6)H_(5)NHOH`C. `HCOOH`D. `C_(6)H_(5)NO_(2)`
Answer» Correct Answer - D Like acetaldehyde and formic acid phenylhydro-oxylamine is a powerful reducing agent Thus it reduces ammonical silver nitrate (Tollens reagent ) and Fehling s solution Nitrobenzene fails to do so .

Discussion

297.	is aA. Primary amineB. Secondary amineC. Tertiary amineD. Ammonium salt
Answer» Correct Answer - A

Discussion

298.	The compound having the molecular formula `C_(3)H_(9)N` can representA. TrimethylamineB. n-propylamineC. IsopropylamineD. All the three
Answer» Correct Answer - D

Discussion

299.	When acetamide is treated with `Br_(2)` and caustic soda, then we getA. Bromoacetic acidB. Acetic acidC. MethylamineD. Ethane
Answer» Correct Answer - C

Discussion

300.	`-CONH_(2) overset("Reduction")to -CH_(2)NH_(2)` In above reaction hybridisation state of carbon changes fromA. `sp to sp^(2)`B. `sp to sp^(3)`C. `sp^(2) to sp^(3)`D. `sp^(2) to sp`
Answer» Correct Answer - C

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.(i) Aniline(ii) Phenol(iii) Anisole(iv) Nitrobenzene

Among the following amines, the strongest Brönsted base is __________.

Which of the following compounds is the weakest Brönsted base?

During the reduction of nitro compound to an amine the oxidation number of nitrogen changes byA. six unitsB. five unitsC. four unitsD. three units

Which of the following is the weakest Brönsted base?

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?(i) H2 (excess)/Pt(ii) LiAlH4 in ether(iii) Fe and HCl(iv) Sn and HCl

Benzylamine may be alkylated as shown in the following equation :C6H5CH2NH2 + R—X → C6H5CH2NHRWhich of the following alkylhalides is best suited for this reaction through SN1 mechanism?(i) CH3Br(ii) C6H5Br(iii) C6H5CH2Br(iv) C2H5 Br

Incorrect statement among the following isA. `-NO_(2)` is a deactivating groupB. Causes the substitution to occur at meta-positionC. Nucleophilic ring substitution in nitrobenzene occurs at ortho and para positionD. Hydrolysis of picryl chloride requires higher temperature than chlorobenzene.

For carbylamine reaction, we need hot alc. KOH andA. any primary amine and chloroformB. chloroform and silver powderC. a primary amine and an alkyl halideD. a mono alkyl amine and trichloromethane

Indicate which nitrogen compund amongst the following would undergo Hofimann reaction ? .A. `RCONHCH_(3)`B. `RCO ONH_(4)`C. `RCONH_(4)`D. `RCONHOH`

Write IUPAC name of

Of the following amines how many can give carbyl amine reaction?

Which of the following give L Liebermann nitroso reaction?A. B. C. D.

Consider the structures: Which of the following statements are correct?A. Basic stength of II is greater than IB. Basic strength of II is less than that of IC. Basic strength of IV is greater than IIID. Basic strength of IV is less than that of III

What is the overall structure of diazepam?A. B. C. D.

Following is an outline for the synthesis of diazepam. A commonly used tranquilizer. The structure of [R] would beA. B. C. D.

Following is an outline for the synthesis of diazepam. A commonly used tranquilizer. The reagent [X] in the reaction could beA. `LiAlH_(4)`B. `NaBH_(4)`C. `OH^-//H_(2)O`D. `AlCl_(3)`

Match the following :

The major product obtained in the reaction is A. B. C. D.

The gas evolved when methylamine reacts with nitrous acid is….A. `NH_(3)`B. `N_(2)`C. `H_(2)`D. `C_(2)H_(6)`

The gas evolved when methylamine reacts with nitrous acid is __________.(i) NH3(ii) N2(iii) H2(iv) C2H6

Consider the nitratio of benzene using mixed conc. `H_(2)SO_(4)` and `HNO_(3)`. If a large amount of `KHSO_(4)` is added to the mixture, the rate of nitration will be `:`A. slowerB. unchangedC. doubledD. faster

Arrange the following in decreasing order of their basic strength: C6H5NH2, C2H5 NH2, (C2H5)2NH, NH3

Arrange the following compounds in the increasing order of their basic strength in aqueous solution. NH3, RNH2, R2NH,R3N (R=C2H5)

In the given reaction sequence `C_(6)H_(5)-CH_(2)-NH_(2) overset(CHCl_(3)//Alc.KOH)underset(Delta)rarr [X] overset(H_(2)O //NaOH)rarr [Y],[Y]` will be:A. `C_(6)H_(5)-CN`B. `C_(6)H_(5)NC`C. `C_(6)H_(5)-CH_(2)-NH_(2)`D. `C_(6)H_(5)-CH_(2)OH`

Explain why `MeNH_(2)` is stronger base than `MeOH`?

Choose the correct comparisons of basicity:A. B. C. D.

`CH_(3)CH_(2)NH_(2) overset((CH_(3)CO)_(2))underset(Delta) to A+B`, (A) and (B) areA. `CH_(3)CH_(2)NHCOCH_(2) + CH_(3)CH_(2)N-=C`B. `CH_(3)CH_(2)NO_(2) + CH_(3)COOH`C. `CH_(3)CH_(2)NHCOCH_(3)+CH_(3)COOH`D. `CH_(3)CH_(2)NO_(2)+CH_(3)CH_(2)NHCOCH_(3)`

If `pK_(b)` for the reaction of `MeNH_(2)` in water is `3.4` the `pK_(a)` for the conjugate acid `Meoverset(+)NH_(3)` will the .A. `14//3.4`B. `14+3.4`C. `(14)(3.4)`D. `14-3.4`

Give a simple chemical test to distinguish between the following pair of compounds : C6H5 - NH2 and C6H5 - NH - CH3

Identify the compound 'B' in the following series of reactions :Ethanenitrile \(\overset{Na/alcohol}{\longrightarrow}\) 'A' \(\overset{NaNO_2/dil.HCI}{\longrightarrow}\) 'B'(a) CH3-CH2-Cl(b) CH3-CH2-NH2(c) CH3-CH2-OH(d) CH3-CH2-CH2-OH

Triethylamine when treated with nitrous acid gives :(a) an alcohol (b) a nitrosamine (c) a monoacetyl derivative (d) a soluble nitrite salt

Which of the following does not reduce Tollens reagent .A. `CH_(3)CHO`B. `C_(6)H_(5)NHOH`C. `HCOOH`D. `C_(6)H_(5)NO_(2)`

is aA. Primary amineB. Secondary amineC. Tertiary amineD. Ammonium salt

The compound having the molecular formula `C_(3)H_(9)N` can representA. TrimethylamineB. n-propylamineC. IsopropylamineD. All the three

When acetamide is treated with `Br_(2)` and caustic soda, then we getA. Bromoacetic acidB. Acetic acidC. MethylamineD. Ethane

`-CONH_(2) overset("Reduction")to -CH_(2)NH_(2)` In above reaction hybridisation state of carbon changes fromA. `sp to sp^(2)`B. `sp to sp^(3)`C. `sp^(2) to sp^(3)`D. `sp^(2) to sp`