NCERT Exemplar solutions for Chemistry [English] Class 12 chapter 13 - Amines [Latest edition]

Which of the following is a 3° amine?

The correct IUPAC name for \[\ce{CH2 = CHCH2 NHCH3}\] 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:

\[\ce{C6H5CH2NH2 + R - X -> C6H5CH2NHR}\]

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 \[\ce{CH2}\] 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 \[\ce{HNO2}\] to form ______.

The gas evolved when methylamine reacts with nitrous acid is:

In the nitration of benzene using a mixture of conc. \[\ce{H2SO4}\] and conc. \[\ce{HNO3}\], the species which initiates the reaction is ______.

Reduction of aromatic nitro compounds using \[\ce{Fe}\] and \[\ce{HCl}\] gives ______.

The most reactive amine towards dilute hydrochloric acid is:

Acid anhydrides on reaction with primary amines give ______.

The reaction \[\ce{Ar\overset{+}{N2}Cl- ->[Cu/HCl] ArCl + N2 + CuCl}\] is anmed 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?

Among the following amines, the strongest Brönsted base is:

The correct decreasing order of basic strength of the following species is ______.

\[\ce{H2O, NH3, OH-, NH^{-}2}\]

Which of the following should be most volatile?

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?

(i) Chlorobenzene

(ii) Bromobenzene

(iii) Iodobenzene

(iv) Fluorobenzene

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

(i) \[\ce{Sn/HCl}\]

(ii) \[\ce{Fe/HCl}\]

(iii) \[\ce{H2 - Pd}\]

(iv) \[\ce{Sn/NH4OH}\]

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

(i) \[\ce{R - NC}\]

(ii) \[\ce{CHCl3}\]

(iii) \[\ce{COCl2}\]

(iv) \[\ce{NaNO2 + HCl}\]

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

(i) \[\ce{SnCl2/HCl}\]

(ii) \[\ce{CH3CH2OH}\]

(iii) \[\ce{H3PO2}\]

(iv) \[\ce{LiAlH4}\]

The product of the following reaction is:

(i) 

(ii) 

(iii)

(iv)

Arenium ion involved in the bromination of aniline is:

(i)

(ii)

(iii)

(iv)

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?

(i)

(ii)

(iii)

(iv)

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.\[\ce{H2SO4 }\] + conc. \[\ce{HNO3}\].

(ii) Acetic anyhdride/pyridine followed by conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].

(iii) Dil. HCl followed by reaction with conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].

(iv) Reaction with conc.\[\ce{HNO3}\] + conc.\[\ce{H2 SO4}\].

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

What is the role of \[\ce{HNO3}\] in the nitrating mixture used for nitration of benzene?

Why is \[\ce{NH2}\] group of aniline acetylated before carrying out nitration?

What is the product when \[\ce{C6H5CH2NH2}\] reacts with \[\ce{HNO2}\]?

What is the best reagent to convert nitrile to primary amine?

Give the structure of ‘A’ in the following reaction.

What is Hinsberg's 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 \[\ce{MeNH2}\] is stronger base than \[\ce{MeOH}\]?

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 \[\ce{CS2}\].

Arrange the following compounds in increasing order of dipole moment.

\[\ce{CH3CH2CH3, CH3CH2NH2, CH3CH2OH}\]

What is the structure and IUPAC name of the compound, allylamine?

Write down the IUPAC name of 

A compound Z with molecular formula \[\ce{C3H9N}\] reacts with \[\ce{C6H5SO2Cl}\] to give a solid, insoluble in alkali. Identify Z.

A primary amine, \[\ce{RNH2}\] can be reacted with \[\ce{CH3-X}\] to get secondary amine, \[\ce{R-NHCH3}\] but the only disadvantage is that 3° amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where \[\ce{RNH2}\] 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?

toluene `->` p-toluidine

How will you carry out the following conversions?

p-toluidine diazonium chloride `→` p-toluic acid

Write following conversions:

nitrobenzene `->` acetanilide

Write following conversions:

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?

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.

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 \[\ce{HCl}\] is required in the reduction of nitro compounds with iron scrap and \[\ce{HCl}\] in the presence of steam.

Reason: \[\ce{FeCl2}\] formed gets hydrolysed to release \[\ce{HCl}\] 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.

A hydrocarbon ‘A’, \[\ce{(C4H8)}\] on reaction with \[\ce{HCl}\] gives a compound ‘B’, \[\ce{(C4H9Cl)}\], which on reaction with 1 mol of \[\ce{NH3}\] gives compound ‘C’, \[\ce{(C4H11N)}\]. On reacting with \[\ce{NaNO2}\] and \[\ce{HCl}\] 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’ \[\ce{(C6H7N)}\] is sparingly soluble in water and gives a water soluble compound ‘B’ on treating with mineral acid. On reacting with \[\ce{CHCl3}\] 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 \[\ce{NaNO2}\] and \[\ce{HCl}\], ‘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.