NCERT Exemplar for Class 12, Chemistry Chapter 13

NCERT Exemplar Class 12 Chemistry Chapter 13: Amines. NCERT Exemplar Solutions for Class 12 Chemistry Chapter 13 Amines prepare students for their Class 12 exams thoroughly.

Chemistry problems and solutions for the Class 12 pdf are provided here which are similar to the questions being asked in the previous year’s board.

Contents

1 NCERT Exemplar Class 12 Chemistry Chapter 13: Amines
- 1.1 Answers

NCERT Exemplar Class 12 Chemistry Chapter 13: Amines

Class 12: Chemistry Chapter 13 solutions. Complete Class 12 Chemistry Chapter 13 Notes.

Multiple Choice Questions (Type-I)

Which of the following is a 3° amine?
- (i) 1-methylcyclohexylamine
- (ii) Triethylamine
- (iii) tert-butylamine
- (iv) N-methylaniline
The correct IUPAC name for CH₂ = CHCH₂NHCH₃ is
- (i) Allylmethylamine
- (ii) 2-amino-4-pentene
- (iii) 4-aminopent-1-ene
- (iv) N-methylprop-2-en-1-amine
Amongst the following, the strongest base in aqueous medium is ____________.
- (i) CH₃ NH₂
- (ii) NCCH₂NH₂
- (iii) (CH₃)₂NH
- (iv) C₆H₅NHCH₃
Which of the following is the weakest Brönsted base?
Benzylamine may be alkylated as shown in the following equation :
C₆H₅CH₂NH₂ + R—X ⎯⎯⎯⎯→ C₆H₅CH₂NHR
Which of the following alkylhalides is best suited for this reaction through S_N1 mechanism?
- (i) CH₃Br
- (ii) C₆H₅Br
- (iii) C₆H₅CH₂Br
- (iv) C₂H₅Br
Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
- (i) H₆(excess)/Pt
- (ii) LiAlH₄in ether
- (iii) Fe and HCl
- (iv) Sn and HCl
In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH₂ group in the carbon chain, the reagent used as source of nitrogen is ___________.
- (i) Sodium amide, NaNH₂
- (ii) Sodium azide, NaN₃
- (iii) Potassium cyanide, KCN
- (iv) Potassium phthalimide, C₆H₄(CO)₂N^–K⁺
The source of nitrogen in Gabriel synthesis of amines is _____________.
- (i) Sodium azide, NaN₃
- (ii) Sodium nitrite, NaNO₂
- (iii) Potassium cyanide, KCN
- (iv) Potassium phthalimide, C₆H₄(CO)₂N^–K⁺
Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.
- (i) 2° R—Br + NH₃
- (ii) 2° R—Br + NaCN followed by H₂/Pt
- (iii) 1° R—NH₂ + RCHO followed by H₂/Pt
- (iv) 1° R—Br (2 mol) + potassium phthalimide followed by H₃O⁺/heat
The best reagent for converting 2-phenylpropanamine into 2–phenylpropanamide is _____.
- (i) excess H₂
- (ii) Br₂ in aqueous NaOH
- (iii) iodine in the presence of red phosphorus
- (iv) LiAlH₄ in ether
The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____.
- (i) excess H₂/Pt
- (ii) NaOH/Br₂
- (iii) NaBH₄/methanol
- (iv) LiAlH₄/ether
Hoffmann Bromamide Degradation reaction is shown by __________.
- (i) ArNH₂
- (ii) ArCONH₂
- (iii) ArNO₂
- (iv) ArCH₂NH₂
The correct increasing order of basic strength for the following compounds is _________.
- (i) II < III < I
- (ii) III < I < II
- (iii) III < II < I
- (iv) II < I < III
Methylamine reacts with HNO 2 to form _________.
- (i) CH₃—O—N = O
- (ii) CH₃—O—CH₃
- (iii) CH₃OH
- (iv) CH₃CHO
The gas evolved when methylamine reacts with nitrous acid is __________.
- (i) NH₃
- (ii) N₂
- (iii) H₂
- (iv) C₂H₆
In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃, the species which initiates the reaction is __________.
- (i) NO₂
- (ii) NO⁺
- (iii) NO₂⁺
- (iv) NO₂^–
Reduction of aromatic nitro compounds using Fe and HCl gives __________.
- (i) aromatic oxime
- (ii) aromatic hydrocarbon
- (iii) aromatic primary amine
- (iv) aromatic amide
The most reactive amine towards dilute hydrochloric acid is ___________.
Acid anhydrides on reaction with primary amines give ____________.
- (i) amide
- (ii) imide
- (iii) secondary amine
- (iv) imine
- (i) Sandmeyer reaction
- (ii) Gatterman reaction
- (iii) Claisen reaction
- (iv) Carbylamine reaction
Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
- (i) Hoffmann Bromamide reaction
- (ii) Gabriel phthalimide synthesis
- (iii) Sandmeyer reaction
- (iv) Reaction with NH₃
Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.
- (i) Aniline
- (ii) Phenol
- (iii) Anisole
- (iv) Nitrobenzene
Which of the following compounds is the weakest Brönsted base?
Among the following amines, the strongest Brönsted base is __________.
The correct decreasing order of basic strength of the following species is _______.
H₂O,NH₃,OH^– ,NH₂^–
- (i) NH₂^– > OH^– > NH₃ > H₂O
- (ii) OH^– > NH₂^– > H₂O > NH₃
- (iii) NH₃ > H₂O > NH₂^– > OH^–
- (iv) H₂O > NH₃ > OH^– > NH₂^–
Which of the following should be most volatile?
- (i) II
- (ii) IV
- (iii) I
- (iv) III
Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?
- (i) Reaction of nitrite with LiAlH₄.
- (ii) Reaction of amide with LiAlH₄ followed by treatment with water.
- (iii) Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.
- (iv) Treatment of amide with bromine in aqueous solution of sodium hydroxide.

Multiple Choice Questions (Type-II)

Note : In the following questions two or more options may be correct.

Which of the following cannot be prepared by Sandmeyer’s reaction?
- (i) Chlorobenzene
- (ii) Bromobenzene
- (iii) Iodobenzene
- (iv) Fluorobenzene
Reduction of nitrobenzene by which of the following reagent gives aniline?
- (i) Sn/HCl
- (ii) Fe/HCl
- (iii) H₂-Pd
- (iv) Sn/NH₄OH
Which of the following species are involved in the carbylamine test?
- (i) R—NC
- (ii) CHCl₃
- (iii) COCl₂
- (iv) NaNO₂ + HCl
The reagents that can be used to convert benzenediazonium chloride to benzene are __________.
- (i) SnCl₂ /HCl
- (ii) CH₃CH₂OH
- (iii) H₃PO₂
- (iv) LiAlH₄
The product of the following reaction is __________.
Arenium ion involved in the bromination of aniline is __________.
Which of the following amines can be prepared by Gabriel synthesis.
- (i) Isobutyl amine
- (ii) 2-Phenylethylamine
- (iii) N-methylbenzylamine
- (iv) Aniline
Which of the following reactions are correct?
Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?
- (i) Acetyl chloride/pyridine followed by reaction with conc. H₂SO₄ + conc. HNO₃.
- (ii) Acetic anyhdride/pyridine followed by conc. H₂SO₄ + conc. HNO₃.
- (iii) Dil. HCl followed by reaction with conc. H₂SO₄ + conc. HNO₃.
- (iv) Reaction with conc. HNO₃ + conc.H₂SO₄ .
Which of the following reactions belong to electrophilic aromatic substitution?
- (i) Bromination of acetanilide
- (ii) Coupling reaction of aryldiazonium salts
- (iii) Diazotisation of aniline
- (iv) Acylation of aniline

Short Answer Type Questions

What is the role of HNO₃ in the nitrating mixture used for nitration of benzene?
Why is NH₂ group of aniline acetylated before carrying out nitration?
What is the product when C₆H₅CH₂NH₂ reacts with HNO₂?
What is the best reagent to convert nitrile to primary amine?
Give the structure of ‘A’ in the following reaction.
What is Hinsberg reagent?
Why is benzene diazonium chloride not stored and is used immediately after its preparation?
Why does acetylation of —NH₂ group of aniline reduce its activating effect?
Explain why MeNH₂ is stronger base than MeOH?
What is the role of pyridine in the acylation reaction of amines?
Under what reaction conditions (acidic/basic), the coupling reaction of aryldiazonium chloride with aniline is carried out?
Predict the product of reaction of aniline with bromine in non-polar solvent such as CS₂.
Arrange the following compounds in increasing order of dipole moment.
CH₃CH₂CH₂, CH₃CH₂NH₂, CH₃CH₂OH
What is the structure and IUPAC name of the compound, allyl amine?
A compound Z with molecular formula C₃H₉N reacts with C₆H₅SO₂Cl to give a solid, insoluble in alkali. Identify Z.
A primary amine, RNH₂ can be reacted with CH₃—X to get secondary amine, R—NHCH₃ but the only disadvantage is that 3° amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where RNH₂ forms only 2° amine?
Complete the following reaction.
Why is aniline soluble in aqueous HCl?
Suggest a route by which the following conversion can be accomplished.
Identify A and B in the following reaction.
How will you carry out the following conversions?
(i) toluene ⎯⎯⎯→ p-toluidine
(ii) p-toluidine diazonium chloride ⎯⎯⎯→ p-toluic acid
Write following conversions:
(i) nitrobenzene ⎯→ acetanilide
(ii) acetanilide ⎯→ p-nitroaniline
A solution contains 1 g mol. each of p-toluene diazonium chloride and p- nitrophenyl diazonium chloride. To this 1 g mol. of alkaline solution of phenol is added. Predict the major product. Explain your answer.
How will you bring out the following conversion?
How will you carry out the following conversion?
How will you carry out the following conversion?
How will you carry out the following conversions?

Matching Type Questions

Note : Match the items of Column I and Column II in the following questions.

Match the reactions given in Column I with the statements given in Column II.
Match the compounds given in Column I with the items given in Column II.

Assertion and Reason Type Questions

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(i) Both assertion and reason are wrong.
(ii) Both assertion and reason are correct statements but reason is not correct explanation of assertion.
(iii) Assertion is correct statement but reason is wrong statement.
(iv) Both assertion and reason are correct statements and reason is correct explanation of assertion.
(v) Assertion is wrong statement but reason is correct statement.

Assertion : Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.
Reason : Acyl group sterically hinders the approach of further acyl groups.
Assertion : Hoffmann’s bromamide reaction is given by primary amines.
Reason : Primary amines are more basic than secondary amines.
Assertion : N-Ethylbenzene sulphonamide is soluble in alkali.
Reason : Hydrogen attached to nitrogen in sulphonamide is strongly acidic.
Assertion : N, N-Diethylbenzene sulphonamide is insoluble in alkali.
Reason : Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.
Assertion : Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.
Reason : FeCl₂ formed gets hydrolysed to release HCl during the reaction.
Assertion : Aromatic 1° amines can be prepared by Gabriel Phthalimide Synthesis.
Reason : Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
Assertion : Acetanilide is less basic than aniline.
Reason : Acetylation of aniline results in decrease of electron density on nitrogen.

Long Answer Type Questions

A hydrocarbon ‘A’, (C₄H₈) on reaction with HCl gives a compound ‘B’, (C₄H₉Cl), which on reaction with 1 mol of NH₃ gives compound ‘C’, (C₄H₁₁N). On reacting with NaNO₂ and HCl followed by treatment with water, compound ‘C’ yields an optically active alcohol, ‘D’. Ozonolysis of ‘A’ gives 2 mols of acetaldehyde. Identify compounds ‘A’ to ‘D’. Explain the reactions involved.
A colourless substance ‘A’ (C₆H₇N) is sparingly soluble in water and gives a water soluble compound ‘B’ on treating with mineral acid. On reacting with CHCl₃ and alcoholic potash ‘A’ produces an obnoxious smell due to the formation of compound ‘C’. Reaction of ‘A’ with benzenesulphonyl chloride gives compound ‘D’ which is soluble in alkali. With NaNO₂ and HCl, ‘A’ forms compound ‘E’ which reacts with phenol in alkaline medium to give an orange dye ‘F’. Identify compounds ‘A’ to ‘F’.
Predict the reagent or the product in the following reaction sequence.

Answers

Answers to Multiple Choice Questions

Answers to Multiple Choice Questions

NCERT Exemplar Solutions

NCERT Class 12 Exemplar Solutions