NCERT Solutions for Class 12 Chemistry Chemistry Part-2 Chapter 13

Amines Class 12

Chapter 13 Amines Exercise Solutions

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In text : Solutions of Questions on Page Number : 384

Q1 :  

Classify the following amines as primary, secondary or tertiary:

(i)

(ii)

(iii) (C2H5)2CHNH2

(iv) (C2H5)2NH


Answer :

Primary: (i) and (iii)

Secondary: (iv)

Tertiary: (ii)

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Q2 :  

(i) Write structures of different isomeric amines corresponding to the molecular formula, C4H11N

(ii) Write IUPAC names of all the isomers.

(iii) What type of isomerism is exhibited by different pairs of amines?


Answer :

(i), (ii) The structures and their IUPAC names of different isomeric amines corresponding to the molecular formula, C4H11N are given below:

(a) CH3-CH2-CH2-CH2-NH2

Butanamine (10)

(b)

Butan-2-amine (10)

(c)

2-Methylpropanamine (10)

(d)

2-Methylpropan-2-amine (10)

(e) CH3-CH2-CH2-NH-CH3

N-Methylpropanamine (20)

(f) CH3-CH2-NH-CH2-CH3

N-Ethylethanamine (20)

(g)

N-Methylpropan-2-amine (20)

(h)

N,N-Dimethylethanamine (3°)

(iii) The pairs (a) and (b) and (e) and (g) exhibit position isomerism.

The pairs (a) and (c); (a) and (d); (b) and (c); (b) and (d) exhibit chain isomerism.

The pairs (e) and (f) and (f) and (g) exhibit metamerism.

All primary amines exhibit functional isomerism with secondary and tertiary amines and vice-versa.

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Q3 :  

How will you convert?

(i) Benzene into aniline

(ii) Benzene into N, N-dimethylaniline

(iii) Cl-(CH2)4-Cl into hexan-1, 6-diamine?


Answer :

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Q4 :  

Arrange the following in increasing order of their basic strength:

(i) C2H5NH2, C6H5NH2, NH3, C6H5CH2NH2 and (C2H5)2NH

(ii) C2H5NH2, (C2H5)2NH, (C2H5)3N, C6H5NH2

(iii) CH3NH2, (CH3)2NH, (CH3)3N, C6H5NH2, C6H5CH2NH2.


Answer :

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Q5 :  

Complete the following acid-base reactions and name the products:

(i) CH3CH2CH2NH2 + HCl

(ii) (C2H5)3N + HCl

 


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Q6 :  

Write reactions of the final alkylation product of aniline with excess of methyl

iodide in the presence of sodium carbonate solution.


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Q7 :  

Write chemical reaction of aniline with benzoyl chloride and write the name of

the product obtained.


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Q8 :  

Write structures of different isomers corresponding to the molecular formula,

C3H9N. Write IUPAC names of the isomers which will liberate nitrogen gas on

treatment with nitrous acid.


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Q9 :  

Convert

(i) 3-Methylaniline into 3-nitrotoluene.

(ii) Aniline into 1,3,5-tribromobenzene.


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<< Previous Chapter 12 : Aldehydes, Ketones and Carboxylic Acids Next Chapter 14 : Biomolecules >>

Exercise : Solutions of Questions on Page Number : 400

Q1 :  

Write IUPAC names of the following compounds and classify them into primary,

secondary and tertiary amines.

(i) (CH3)2 CHNH2 (ii) CH3(CH2)2NH2

(iii) CH3NHCH(CH3)2 (iv) (CH3)3CNH2

(v) C6H5NHCH3 (vi) (CH3CH2)2NCH3

(vii) m-BrC6H4NH2


Answer :

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Q2 :  

Give one chemical test to distinguish between the following pairs of compounds.

(i) Methylamine and dimethylamine

(ii) Secondary and tertiary amines

(iii) Ethylamine and aniline

(iv) Aniline and benzylamine

(v) Aniline and N-methylaniline.


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Q3 :  

Account for the following:

(i) pKb of aniline is more than that of methylamine.

(ii) Ethylamine is soluble in water whereas aniline is not.

(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

(iv) Although amino group is o, p- directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

(v) Aniline does not undergo Friedel-Crafts reaction.

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.


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Q4 :  

Arrange the following:

(i) In decreasing order of the pKbvalues:

C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2

(ii) In increasing order of basic strength:

C6H5NH2, C6H5N(CH3)2, (C2H5)2NH and CH3NH2

(iii) In increasing order of basic strength:

(a) Aniline, p-nitroaniline and p-toluidine

(b) C6H5NH2, C6H5NHCH3, C6H5CH2NH2.

(iv) In decreasing order of basic strength in gas phase:

C2H5NH2, (C2H5)2NH, (C2H5)3N and NH3

(v) In increasing order of boiling point:

C2H5OH, (CH3)2NH, C2H5NH2

(vi) In increasing order of solubility in water:

C6H5NH2, (C2H5)2NH, C2H5NH2.


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Q5 :  

How will you convert:

(i) Ethanoic acid into methanamine

(ii) Hexanenitrile into 1-aminopentane

(iii) Methanol to ethanoic acid

(iv) Ethanamine into methanamine

(v) Ethanoic acid into propanoic acid

(vi) Methanamine into ethanamine

(vii) Nitromethane into dimethylamine

(viii) Propanoic acid into ethanoic acid


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Q6 :  

Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.


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Q7 :  

Write short notes on the following:

(i) Carbylamine reaction (ii) Diazotisation

(iii) Hofmann's bromamide reaction (iv) Coupling reaction

(v) Ammonolysis (vi) Acetylation

(vii) Gabriel phthalimide synthesis.


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Q8 :  

Accomplish the following conversions:

(i) Nitrobenzene to benzoic acid

(ii) Benzene to m-bromophenol

(iii) Benzoic acid to aniline

(iv) Aniline to 2,4,6-tribromofluorobenzene

(v) Benzyl chloride to 2-phenylethanamine

(vi) Chlorobenzene to p-chloroaniline

(vii) Aniline to p-bromoaniline

(viii) Benzamide to toluene

(ix) Aniline to benzyl alcohol.


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Q9 :  

Give the structures of A, B and C in the following reactions:

(i)

(ii)

(iii)

(iv)

(v)

(vi)


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Q10 :  

An aromatic compound 'A' on treatment with aqueous ammonia and heating

forms compound 'B' which on heating with Br2 and KOH forms a compound 'C'

of molecular formula C6H7N. Write the structures and IUPAC names of compounds A, B and C.


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Q11 :  

Complete the following reactions:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)


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Q12 :  

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?


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Q13 :  

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.


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Q14 :  

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.


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<< Previous Chapter 12 : Aldehydes, Ketones and Carboxylic Acids Next Chapter 14 : Biomolecules >>

Chemistry Part-2 - Chemistry : CBSE NCERT Exercise Solutions for Class 12th for Amines will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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