List of top Chemistry Questions on Amines

Identify correct statements: (A) Primary amines do not give diazonium salts when treated with NaNO2{NaNO}_2 in acidic condition.
(B) Aliphatic and aromatic primary amines on heating with CHCl3{CHCl}_3 and ethanolic KOH{KOH} form carbylamines.
(C) Secondary and tertiary amines also give carbylamine test.
(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
(E) Tertiary amines react with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below:

Amines have a lone pair of electrons on the nitrogen atom, due to which they behave as Lewis bases. Greater the value of Kb K_b or smaller the value of pKb pK_b , stronger is the base. Amines are more basic than alcohols, ethers, esters, etc. The basic character of aliphatic amines should increase with the increase of alkyl substitution. However, it does not occur in a regular manner, as a secondary aliphatic amine is unexpectedly more basic than a tertiary amine in aqueous solutions. Aromatic amines are weaker bases than ammonia and aliphatic amines. Electron-releasing groups such as −CH3 -CH_3 , −NH2 -NH_2 , etc., increase the basicity, while electron-withdrawing substituents such as −NO2 -NO_2 , −CN -CN , halogens, etc., decrease the basicity of amines. The effect of these substituents is more pronounced at the para-position than at the meta-position.

(a) Arrange the following in increasing order of their basic character. Give reason:
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Amines have a lone pair of electrons on nitrogen atom due to which they behave as Lewis base. Greater the value of Kb K_b or smaller the value of pKb pK_b , stronger is the base. Amines are more basic than alcohols, ethers, esters, etc. The basic character of aliphatic amines should increase with the increase of alkyl substitution. But it does not occur in a regular manner as a secondary aliphatic amine is unexpectedly more basic than a tertiary amine in aqueous solutions. Aromatic amines are weaker bases than ammonia and aliphatic amines. Electron releasing groups such as –CH3–CH_3, –NH2–NH_2, etc., increase the basicity while electron-withdrawing substituents such as –NO2–NO_2, –CN, halogens, etc., decrease the basicity of amines. The effect of these substituents is more at the p₊ than at m₋ position.
Assertion (A): Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis. Reason (R): Aryl halides do not undergo nucleophilic substitution reaction with the anion formed by phthalimide.
Give plausible explanation for each of the following:
Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis.
Arrange the following compounds in increasing order of their boiling point:
(CH3)2NH, CH3CH2NH2,CH3CH2OH \text{(CH}_3\text{)}_2\text{NH, CH}_3\text{CH}_2\text{NH}_2, \text{CH}_3\text{CH}_2\text{OH}
Give plausible explanation for each of the following:
Amides are less basic than amines.
The best reagent for converting propanamide into propanamine is:

Total number of molecules/species from the following which will be paramagnetic is ………. O2,O2+,O2−,NO,NO2,CO,K2[NiCl4],[Co(NH3)6]Cl3,K2[Ni(CN)4] O_2, O_2^+, O_2^-, NO, NO_2, CO, K_2[NiCl_4], [Co(NH_3)_6]Cl_3, K_2[Ni(CN)_4]

The total number of compounds from below when treated with hot KMnO4 giving benzoic acid is:

 

The major product of the following reaction is: 


 

The purification method based on the following physical transformation is: Solid→HeatVapour→CoolSolid {Solid} \xrightarrow{{Heat}} {Vapour} \xrightarrow{{Cool}} {Solid}
Consider an elementary reaction: A(g)+B(g)→C(g)+D(g) A(g) + B(g) \rightarrow C(g) + D(g) If the volume of the reaction mixture is suddenly reduced to 13 \frac{1}{3} of its initial volume, the reaction rate will become x x times of the original reaction rate. The value of x x is:

Identify correct statements: 
(A) Primary amines do not give diazonium salts when treated with NaNO2{NaNO}_2 in acidic condition. 
(B) Aliphatic and aromatic primary amines on heating with CHCl3{CHCl}_3 and ethanolic KOH{KOH} form carbylamines. 
(C) Secondary and tertiary amines also give carbylamine test. 
(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent. 
(E) Tertiary amines react with benzenesulfonyl chloride very easily. 
Choose the correct answer from the options given below:

The product B formed in the following reaction sequence is: C6H5CN→HCl(A)→AgCN(B) {C}_6{H}_5{CN} \xrightarrow{{HCl}} (A) \xrightarrow{{AgCN}} (B)

Identify the inorganic sulphides that are yellow in colour: 
(A) (NH4)2S ({NH}_4)_2{S}  
(B) PbS {PbS}  
(C) CuS {CuS}  
(D) As2S3 {As}_2{S}_3  
(E) As2S5 {As}_2{S}_5  
Choose the correct answer from the options given below:

Identify product [A], [B], and [C] in the following reaction sequence.


 

What will be the increasing order of basic strength of the following compounds: C2H5NH2,(C2H5)2NH,(C2H5)3N,C6H5NH2\text{C}_2\text{H}_5\text{NH}_2, (\text{C}_2\text{H}_5)_2\text{NH},(\text{C}_2\text{H}_5)_3\text{N},\text{C}_6\text{H}_5\text{NH}_2
What is the major product of Carbylamine reaction?
Match List-I with List-II:
Figure

Choose the correct answer from the options given below:
The azo-dye (Y) formed in the following reactions is: Sulphanilic acid + NaNO2_2 + CH3_3COOH → X
A compound (x x ) with molar mass 108 g mol−1 108 \, \text{g mol}^{-1} undergoes acetylation to give a product with molar mass 192 g mol−1 192 \, \text{g mol}^{-1} . The number of amino groups in the compound (x x ) is ______.
Given below are two statements:
Statement I: Aniline reacts with con. H2SO4 H_2SO_4 followed by heating at 453–473 K gives p-aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'.
Statement II: In Friedel-Craft's alkylation and acylation reactions, aniline forms salt with the AlCl3 AlCl_3 catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as a deactivating group.
In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements:
Statement (I) : All the following compounds react with p-toluenesulfonyl chloride.
C6H5NH2   (C6H5)2NH        (C6H5)3NC_6H_5NH_2 \quad      (C_6H_5)_2NH                \quad (C_6H_5)_3N
Statement (II) : Their products in the above reaction are soluble in aqueous NaOH.
In the light of the above statements, choose the correct answer from the options given below.
Number of amine compounds from the following giving solids which are soluble in NaOH upon reaction with Hinsberg's reagent is _____.
amine