Solution of Chapter 13. Amines (Chemistry - Exemplar Book)

Which of the following is a 3° amine?

The correct IUPAC name for CH₂=CHCH₂ NHCH₃ is

Amongst the following, the strongest base in aqueous medium is ____________.

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?

Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?

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 ___________.

The source of nitrogen in Gabriel synthesis of amines is _____________.

Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.

The best reagent for converting 2–phenylpropanamide into 2-phenylpropanamine is _____.

The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____.

Hoffmann Bromamide Degradation reaction is shown by __________.

The correct increasing order of basic strength for the following compounds is _________.

(I)

(II)

(III)

Methylamine reacts with HNO₂ to form _________.

The gas evolved when methylamine reacts with nitrous acid is __________.

In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃, the species which initiates the reaction is __________.

Reduction of aromatic nitro compounds using Fe and HCl gives __________.

The most reactive amine towards dilute hydrochloric acid is ___________.

Acid anhydrides on reaction with primary amines give ____________.

The reaction is named as _________.

Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is

Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.

Which of the following compounds is the weakest Brönsted base?

(i)

(ii)

(iii)

(iv)

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^–

Which of the following should be most volatile?

(I) CH₃CH₂CH₂NH₂

(II) (CH₃)₃N

(III)

(IV) CH₃CH₂CH₃

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?

Which of the following cannot be prepared by Sandmeyer’s reaction?

Reduction of nitrobenzene by which of the following reagent gives aniline?

Which of the following species are involved in the carbylamine test?

The reagents that can be used to convert benzenediazonium chloride to benzene are __________.

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.

Which of the following reactions are correct?

A.

B.

C.

D.

Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?

Which of the following reactions belong to electrophilic aromatic substitution?

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.

CH₃CH₂CH₃, CH₃CH₂NH₂, CH₃CH₂OH

What is the structure and IUPAC name of the compound, allyl amine?

Write down the IUPAC name of

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 pnitrophenyl 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?

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 : 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.

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.

Assertion : Hoffmann’s bromamide reaction is given by primary amines.

Reason : Primary amines are more basic than secondary amines.

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.

Assertion : N-Ethylbenzene sulphonamide is soluble in alkali.

Reason : Hydrogen attached to nitrogen in sulphonamide is strongly acidic.

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.

Assertion : N, N-Diethylbenzene sulphonamide is insoluble in alkali.

Reason : Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.

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.

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.

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.

Assertion : Aromatic 1° amines can be prepared by Gabriel Phthalimide Synthesis.

Reason : Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.

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.

Assertion : Acetanilide is less basic than aniline.

Reason : Acetylation of aniline results in decrease of electron density on nitrogen.

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.

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.