CBSE Questions for Class 12 Engineering Chemistry Amines Quiz 10 - MCQExams.com

Which of the following statements is correct?
  • Aliphatic amines are stronger bases than ammonia.
  • Aromatic amines are stronger bases than ammonia.
  • The alkyl group in alkyl ammonium ion more stabilizes the ion relative to the amine.
  • The aryl group in aryl ammonium ion less stabilizes the ion relative to the amine.
$$C$$ and $$D$$ in the given sequence are :
263375_010deaf9dca04b69b477d26af7ad347a.png
  • Benzoic acid$$+$$ aniline
  • Phthalic acid $$+$$ ethylamine
  • Phthalic acid $$+$$ aniline
  • Benzoic acid $$+$$ ethylamine
The correct set of products obtained in the following reactions
$$RCN\xrightarrow [  ]{ reduction }  (A)$$, $$RCN \xrightarrow [ (ii){ H }_{ 2 }O ]{ (i){ CH }_{ 3 }MgBr }  (B)$$, $$RNC \xrightarrow [  ]{ hydrolysis }  (C)$$, $$R{NH}_{2}\xrightarrow [  ]{ H{NO}_{2} }  (D)$$
The answer is:
  • $$(A): {2}^{o}$$ Amine; $$(B)$$: Methyl ketone; $$(C):{1}^{o}$$ Amine; $$(D)$$ Alcohol
  • $$(A): {1}^{o}$$ Amine; $$(B)$$: Methyl ketone; $$(C):{1}^{o}$$ Amine; $$(D)$$ Alcohol
  • $$(A): {2}^{o}$$ Amine; $$(B)$$: Methyl ketone; $$(C):{2}^{o}$$ Amine; $$(D)$$ Acid
  • $$(A): {2}^{o}$$ Amine; $$(B)$$: Methyl ketone; $$(C):{2}^{o}$$ Amine; $$(D)$$ Aldehyde
$${CH}_{3}{CH}_{2}{NH}_{2}$$ is soluble in:
  • dilute $$HCl$$
  • $$Cu{SO}_{4}$$ solution
  • $$Ag{NO}_{3}$$
  • none of these
The compound formed is an energetically stable, yellow azo dye (the azo group is $$-N=N-$$). The stability is due to extensive delocalisation of electrons via the nitrogen-nitrogen double bonds.
The azo dye obtained on reacting 4-aminophenol with nitrous acid (in dilute hydrochloric acid) below $${10}^{o}C$$ and coupling the resulting diazonium salt with phenol is:

263838.PNG
Arrange the following resonating structure according to their contribution towards resonance hybrid?
(a) $$CH_2=\overset {\oplus}{N}=\overset {\ominus}{N}$$ (b) $$\overset {\ominus}{C}H_2-N=\overset {\oplus}{N}:$$ (c) $$\overset {\oplus}{C}H_2-\underset {. .}{N}=\overset {\ominus}{N}$$ (d) $$\overset {\ominus}{C}H_2-\overset {\oplus}{N}\equiv \overset {. .}{N}$$
  • a > d > c > b
  • b > a > c > d
  • a > c > b > d
  • d > a > b > c
Correct order of basicity of following molecule :
290748_f578128ca1744841b1600b54e46c8eaf.png
  • I > II > III > IV
  • II > I > III > IV
  • II > III > I > IV
  • II > III > IV > I
Consider the given ions.
The reactivities of these ions in a azo-coupling reaction (under similar conditions) will be such that :
263654_fe544f0d93d74826964461b80bc73c26.png
  • $$(I)< (IV)< (II)< (III)$$
  • $$(I)< (III)< (IV)< (II)$$
  • $$(III)< (I)< (IV)< (II)$$
  • $$(III)< (I)< (II)<(IV)$$
Amongst the following the most basic compound is-
The basic character of substituted anilines (I to IV) are such that :
275686_f1247c3960cb4afc83e38c9335b7bfe7.png
  • I < II < IV < III
  • I < II < III < IV
  • II < I < III < IV
  • III < IV < I < II
Among the following the weakest base is:
  • $$C_6H_5CH_2NH_2$$
  • $$C_6H_5CH_2NHCH_3$$
  • $$O_2N-CH_2NH_2$$
  • $$CH_3NHCHO$$
Which of the following is/are correct statement/statements ?
  • Guanidine $$\begin{bmatrix}NH_2-\underset{\underset{NH}{||}}{C}-NH_2\end{bmatrix}$$ is more basic than pyridine because conjugate acid of guanidine has three equal contributing resonating structure.
  • Diethylamine is weaker base than triethylamine in aqueous medium.
  • Ortho-methyl aniline is weaker base than para-methyl aniline.
  • $$2,\,4,\,6$$-Trinitro-$$N,\,N$$-dimethyl aniline is stronger base than $$2,\,4,\,6$$-Trinitro aniline.
The correct order of increasing basic nature of the following base is :
305229_045853466d6c4aaab850d03baa6f485f.png
  • 2 < 5 < 1 < 3 < 4
  • 5 < 2 < 1 < 3 < 4
  • 2 < 5 < 1 < 4 < 3
  • 5 < 2 < 1 < 4 < 3
Arrange the following in the increasing order of the $$\displaystyle{pK}_b$$ values:
i) $$ C_2H_5NH_2 $$
ii)$$\,{ C }_{ 6 }{ H }_{ 5 }{ NHCH }_{ 3 }$$
iii)$$\,({ C }_{ 2}{ H }_{ 5 }{ ) }_{ 2 }NH$$
iv) $$ { C }_{ 6 }{ H }_{ 5 }{ NH }_{ 2 }$$
  • i < ii < iii < iv
  • iii < i < ii < iv
  • i < iii < ii < iv
  • iv < ii < i < iii
Arrange the following in the decreasing order of the $$\displaystyle{pK}_b$$ values: 
$$i)\,\displaystyle { C}_{ 2 }{ H }_{ 5 }{ NH }_{ 2 }$$ 
$$ii) \,{ C }_{ 6 }{ H }_{ 5 }{ NHCH }_{ 3 }$$ 
$$iii) \,({ C }_{ 2}{ H }_{ 5 }{ ) }_{ 2 }NH$$ 
$$iv) { C }_{ 6 }{ H }_{ 5 }{ NH }_{ 2 }$$
  • $$i > ii > iii > iv$$
  • $$iii > i > ii > iv$$
  • $$i > iii > ii > iv$$
  • $$ii > i > iii > iv$$
Iso-propyl amine is a:
  • primary amine
  • secondary amine
  • teritary amine
  • quaternary amine
Identify the compounds from the following which form primary amines under suitable reduction conditions.
1. $$C_2H_5NC$$
$$C_2H_6$$
$$C_2H_5CONH_2$$
$$C_6H_5NO_2$$
  • $$1, 4$$
  • $$3, 4$$
  • $$1, 3, 4$$
  • $$2, 3, 4$$
Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is: 
I. $$H_3N^+ - CH(CH_3)CO_2H$$
II. $$H_2N - CH(CH_3)CO_2^-$$
III. $$H_3N^+ - CH(CH_3)CO_2^-$$
IV. $$H_2N -CH(CH_3)CO_2H$$
  • I and II
  • I and III
  • II and III
  • III and IV
Predict respectively $$'X'$$ and $$'Y'$$ in the following reactions
$$Ar-N{ H }_{ 2 }\xrightarrow { \quad \quad X\quad \quad  } Ar-\overset { + }{ N } \equiv N.{ Cl }^- \xrightarrow { \quad \quad Y\quad \quad  } $$$$Ar-Cl$$
  • $$NaN{ O }_{ 3 }$$ & $${ Cl }_{ 2 }$$
  • $$NaN{ O }_{ 3 }-HCl$$ & $$HCl$$
  • $$NaN{ O }_{ 2 }-HCl$$ & $${ Cu }/{ HCl }$$
  • $$NaN{ O }_{ 2 }-HCl$$ & $$NaN{ H }_{ 2 }$$
The compound R is:
478187_923ce6b11bf74b299b67a29d8289fdbe.PNG
A compound $$X$$ has molecular formula $${C}_{7}{H}_{7}NO$$. On treatment with $${Br}_{2}$$ and $$KOH$$, $$X$$ gives an amine $$Y$$. The later gives carbylamine test. $$Y$$ upon diazotisation and coupling with phenol gives an azo dye. Thus, $$X$$ is :
  • $${C}_{6}{H}_{5}N{O}_{2}$$
  • $${C}_{6}{H}_{5}COON{H}_{4}$$
  • $${C}_{6}{H}_{5}CON{H}_{2}$$
  • none of the above
$$CH_3CH_2CH_2CN+2H_2\xrightarrow {Pd}$$

Which of the following compound is formed in the above reaction?
  • $$CH_3CH_2CH_2CH_2NH_2$$
  • $$CH_3CH_2CH_2NH_2$$
  • $$CH_3CH_2CH_2CH_2CH_2NH_2$$
  • None of the above
In the reduction of nitriles to prepare primary amine:
  • $$LiAlH_4$$ is used.
  • $$NaBH_4$$ is used.
  • $$Sn/HCl$$ is used.
  • none of these.
Predict the product.
$$CH_3-CH_2-CN + H_2/Ni \rightarrow$$?
  • $$CH_3-CH_2-CH_2-NH_2$$
  • $$CH_3-CH_2-NH_2$$
  • both a and b
  • none of these
The reduction of nitrile gives ascent of amine series indicating:
  • preparation of amines containing two carbon atom more than starting amine
  • preparation of amines containing one carbon atom more than starting amine
  • preparation of amines containing three carbon atom more than starting amine
  • preparation of amines containing four carbon atom more than starting amine
The compound T is:
478188_ab9c9c1599de40f596eb0523b7bcdd3e.PNG
  • Glycine
  • Alanine
  • Valine
  • Serine
Which of the following represents the correct order of basic strength?
  • N,N-Dimethylaniline $$>$$ N-methylaniline $$>$$ aniline
  • N,N-Dimethylaniline $$>$$ aniline $$>$$ N-methylaniline
  • aniline $$>$$ N-methylaniline $$>$$ N,N-Dimethyl aniline
  • N-methylaniline $$>$$ N,N-Dimethylaniline $$>$$ aniline
In the given set of reactions, the IUPAC name of product $$Y$$ is:

$$2-\text{Bromopropane} \xrightarrow [ alc.\ KOH ]{ AgCN }\ \ X\xrightarrow [  ]{ LiAl{ H }_{ 4 } }\ \ Y\quad $$
  • N-methylpropanamine
  • N-isopropylmethanamine
  • butan-2-amine
  • N-methylpropan-2-amine
Point out the correct decreasing order of $$pK_b$$ values of following amines:
$$C_2H_5NH_2 $$ , $$C_6H_5NHCH_3,$$ $$(C_2H_5)_2NH$$ and $$C_6H_5NH_2$$
  • $$(C_2H_5)_2NH > C_2H_5NH_2 > C_6H_5NHCH_3 > C_6H_5NH_2$$
  • $$(C_2H_5)_2NH > C_6H_5NHCH_3 > C_6H_5NH_2 > C_2H_5NH_2$$
  • $$C_6H_5NH_2 > C_6H_5NHCH_3 > C_2H_5NH_2 > (C_2H_5)_2NH$$
  • $$C_2H_5NH_2 > (C_2H_5)_2NH > C_6H_5NHCH_3 > C_6H_5NH_2 $$
Acetonitrile on reduction gives:
  • ethanamine 
  • propanamine
  • methanamine
  • None of the above
Among the following substituted pyridines, the most basic compound is:
The correct basicity order of the following compound is :
584781_64eaa3d9b77d4670adaf2a77c7d182ce.png
  • $$I > III > II > IV$$
  • $$III > I > II > IV$$
  • $$II > I > III > IV$$
  • $$I > II > III > IV$$
Which of the following is the correct order of the solubility in water?
  • propane $$<$$ ethylamine $$<$$ ethyl alcohol
  • propane $$<$$ ethyl alcohol $$<$$ ethylamine
  • ethyl alcohol $$<$$ propane $$<$$ ethylamine
  • ethyl alcohol $$<$$ ethylamine $$<$$ propane
Benzylamine is a stronger base than aniline because:
  • the lone pair of electrons on the nitrogen atom in benzylamine is delocalised
  • the lone pair of electrons on the nitrogen atom in aniline is delocalised
  • the lone pair of electrons on the nitrogen atom in aniline is not involved in resonance
  • benzylamine has a higher molecular mass than aniline
Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute hydrochloric acid. The compound so formed is reacted with a tetrafluoroborate which is subsequently heated. The final product is:
  • $$p-bromoaniline$$
  • $$p-bromofluorobenzene$$
  • $$1, 3, 5-tribromobenzene$$
  • $$2, 4, 6 - tribromofluorobenzene$$
Gabriel synthesis is used for synthesis of:
  • primary amines
  • secondary amines
  • aldehydes
  • acids
Gabriel phthalimide synthesis is used in the preparation of primary amine from phthalimide which of the following reagent is not used during the process?
  • HCl
  • NaOH
  • Alkyl Halides
  • KOH
Which one of the following will be most basic?
  • Aniline
  • P-methoxyaniline
  • P-nitroaniline
  • Benzylamine
The correct order of increasing basic nature for the bases $$NH_3, CH_3NH_2$$ and $$(CH_3)_2NH$$ in aqueous solutions.
  • $$NH_3 < CH_3NH_2 <(CH_3)_2NH$$
  • $$CH_3NH_2 < NH_3 < CH_3)_2NH$$
  • $$CH_3NH_2 < (CH_3)_2NH < NH_3$$
  • $$(CH_3)_2NH < NH_3 < CH_3NH_2$$
Which of the following is an example of carbylamine reaction?
  • $$2PhNH_2+CS_2\xrightarrow[\begin{matrix}\Delta\\(ii)\,conc.HCl\end{matrix}]{(i)KOH}Ph-NCS$$
  • $$R-NH_2+HNO_2\xrightarrow{0-5^oC} R- OH+N_2+HCl$$
  • $$Ph-NH_2+CHCl_3+3KOH(alc.)\xrightarrow{\Delta} Ph-NC+3KCl+3H_2O$$
  • $$Ph_2-NH+HONO\rightarrow Ph_2-N-N=O+H_2O$$
Pick the correct statement among the following.
  • Sodium lauryl sulphate forms an insoluble scum with hard water.
  • Sodium dodecyl benzene sulphonate used in tooth paste is a cationic detergent.
  • Cetyl-trimethyl ammonium bromide is a popular cationic detergent used in hair conditioner.
  • Non-ionic detergents is formed when polyethylene glycol reacts with adipic acid.
The order of basicity among the following compounds is:
640591_e9ab6a12616c47b5b1277a66d340cdfa.png
  • $$I > IV > III > II$$
  • $$II > I > IV > III$$
  • $$IV > I > II > III$$
  • $$IV > II > III > I$$
Amines behave as:
  • Lewis acids
  • Lewis base
  • aprotic acid
  • neutral compound
Between any two of the following molecules, hydrogen bonding is not possible:
  • two primary amine molecules
  • two secondary amine molecules
  • two tertiary amine molecules
  • two ammonia molecules
Gabriel's phthalimide synthesis can be used to prepare:
  • ethanamine
  • n-methylmethanamine
  • benzeneamine
  • $$N, N-$$ dimethylmethanamine
  • p-toluidine
Which one of the following is used as a test for aliphatic primary amines ?
  • Tollen's test
  • Fehling's lest
  • Isocyanide test
  • Azo dye test
  • Phthalein fusion test.
Which one of the following can be prepared by Gabriel phthalimide synthesis?
  • Aniline
  • $$o$$-toluidine
  • Benzylamine
  • N-methylethanamine
  • 4-bromoaniline
$$CH_3CH_2Cl \xrightarrow {NaCN}X \xrightarrow{Ni/H_2}Y \xrightarrow{acetic\, anhydride}Z$$ 
In the above reaction sequence, $$Z$$ is:
  • $$CH_3CH_2CH_2NHCOCH_3$$
  • $$CH_3CH_2CH_2NH_2$$
  • $$CH_3CH_2CH_2CONHCH_3$$
  • $$CH_3CH_2CH_2CONHCOCH_3$$
$$C{ H }_{ 3 }Br+KCN\left( alc. \right) \longrightarrow X\xrightarrow [ \quad Na+{ C }_{ 2 }{ H }_{ 5 }OH\quad  ]{ \quad Reduction\quad  } Y$$
What is $$Y$$ in the series?
  • $$C{ H }_{ 3 }CN$$
  • $${ C }_{ 2 }{ H }_{ 5 }CN$$
  • $${ C }_{ 2 }{ H }_{ 5 }N{ H }_{ 2 }$$
  • $$C{ H }_{ 3 }N{ H }_{ 2 }$$
Which of the following are P and S in the series of reactions?
642056_408143e8c37b49b781d101e6e93b158f.png
  • $$C_2H_5MgX$$ and $$(C_2H_5)_2NCH_3$$
  • $$CH_3MgX$$ and N-methyl-$$2$$-butanamine
  • $$CH_3MgX$$ and N-ethyl-$$2$$-butanamine
  • $$C_2H_5MgX$$ and $$(CH_3)_2NC_2H_5$$
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