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Recognize the compound C from the following
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JEE • CHEMISTRY • AMINES
Amines practice · Mixed difficulty
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31
Medium
31 of 132
Analyzing
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On hydrolysis of a "compound", two compounds are obtained. One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollen's reagent and Fehling's solution. The "compound" is
View answer and explanation
Correct option: B
Option B (CH3CH2CH2NC) is correct because the hydrolysis of propyl isocyanide yields propylamine and formic acid. Propylamine, upon treatment with NaNO2 and HCl, gives propanol, which does not respond to the iodoform test. Formic acid reduces Tollen's reagent and Fehling's solution.
32
Hard
32 of 132
Application
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The product formed in the reaction is
View answer and explanation
Correct option: D
pentanamine
Option D (pentanamine) is correct because the reaction is a Hofmann degradation, which converts an amide to an amine with one fewer carbon atom.
33
Easy
33 of 132
Analyzing
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Assertion (A) Gabriel phthalimide reaction can be used to prepare aryl and alkyl amines.
Reason (R) Both Aryl halides have same reactivity as alkyl halides towards nucleophilic substitution reactions.
Reason (R) Both Aryl halides have same reactivity as alkyl halides towards nucleophilic substitution reactions.
View answer and explanation
Correct option: D
If both Assertion and Reason and false.
Option D is correct because Gabriel phthalimide reaction cannot be used to prepare aryl amines, and aryl halides are less reactive than alkyl halides in nucleophilic substitution.
34
Easy
34 of 132
Analyzing
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Which can be used to distinguish
View answer and explanation
Correct option: A
Diazotisation followed with coupling with phenol
Option A is correct because diazotization followed by coupling with phenol will produce an orange-red dye with aniline (C6H5NH2), distinguishing it from benzylamine (C6H5CH2NH2).
35
Medium
35 of 132
Understanding
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Statement-1 : Nitrating mixture used for carrying out nitration of benzene consists of conc. conc. .
Statement-2 : In presence of acts as a base and produces ions.
Statement-2 : In presence of acts as a base and produces ions.
View answer and explanation
Correct option: A
Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement -1
Option A (Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement -1) is correct because the nitrating mixture consists of concentrated nitric acid and concentrated sulfuric acid, where sulfuric acid acts as a catalyst and helps generate the nitronium ion ().
36
Medium
36 of 132
Application
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The major product in the following reaction is
View answer and explanation
Correct option: A
Option A () is correct because the reaction of ethylamine with NaNO2/HCl followed by hydrolysis yields ethanol.
37
Medium
37 of 132
Understanding
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Benzene diazonium chloride reacts with hypophosphor ous acid to produce
View answer and explanation
Correct option: B
Benzene
Option B (Benzene) is correct because benzene diazonium chloride reacts with hypophosphorous acid () to yield benzene, nitrogen gas, hydrochloric acid, and phosphorous acid.
38
Medium
38 of 132
Analyzing
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Select corerct statement(s).
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because all three statements regarding cyanamide ion, magnesium carbide, and calcium carbide are accurate.
39
Easy
39 of 132
Understanding
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Reaction of nitrous acid on aliphatic amines in cold will give:
View answer and explanation
Correct option: B
An alcohol
Option B (An alcohol) is correct because primary aliphatic amines react with nitrous acid in cold conditions to form diazonium salts, which are unstable and decompose to form alcohols.
40
Medium
40 of 132
Analyzing
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chloro aniline and anilinium hydrogen chloride can be distinguished by
View answer and explanation
Correct option: D
Option D () is correct because anilinium hydrogen chloride reacts with to give a white precipitate of AgCl, while p-chloroaniline does not.
41
Easy
41 of 132
Analyzing
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Benzyl amine cannot be prepared by
View answer and explanation
Correct option: D
Option D is correct because on reduction with gives a secondary amine, not benzyl amine.
42
Easy
42 of 132
Understanding
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The correct order of the basic strength of methyl substituted amines in aqueous solution is:
View answer and explanation
Correct option: A
Option A ({(C{H_3})_2}NH > C{H_3}N{H_2} > {(C{H_3})_3}N) is correct because in aqueous solution, the basic strength order is secondary > primary > tertiary due to a combination of inductive effect, solvation, and steric hindrance.
43
Medium
43 of 132
Remembering
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The reaction, is named as
View answer and explanation
Correct option: B
Gattermann reaction
Option B (Gattermann reaction) is correct because the reaction of arenediazonium chloride with Cu/HCl to form aryl chloride is known as the Gattermann reaction.
44
Medium
44 of 132
Analyzing
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Given below are two statements:
Statement I: Aniline reacts with con. , followed by heating at gives 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 catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as deactivating group.
In the light of the above statements, choose the correct answer from the options given below:
Statement I: Aniline reacts with con. , followed by heating at gives 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 catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as deactivating group.
In the light of the above statements, choose the correct answer from the options given below:
View answer and explanation
Correct option: C
Both statement I and statement II are true
The correct answer is C (Both statement I and statement II are true) because aniline does form p-aminobenzene sulfonic acid and gives a positive Lassaigne's test, and it also forms a salt with AlCl3, deactivating the ring.
45
Medium
45 of 132
Understanding
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Statement I: In Sandmeyer reaction nucleophiles like and are introduced in benzene ring in the presence of ion.
Statement-II : In Gattermann rection nucleophiles are introduced in benzene ring in the presence of copper powder and
Statement-II : In Gattermann rection nucleophiles are introduced in benzene ring in the presence of copper powder and
View answer and explanation
Correct option: A
Both statement I and II are correct
Both statement I and II are correct. Sandmeyer reaction uses Cu+ ions to introduce nucleophiles, and Gattermann reaction uses copper powder and HCl to introduce nucleophiles into the benzene ring.
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46
Medium
46 of 132
Analyzing
+4 | -1
Recognize the compound C from the following
View answer and explanation
Correct option: C
Ethylamine
Option C (Ethylamine) is correct because the reaction sequence involves conversion of ethylamine to ethanol, then to ethyl chloride, and finally back to ethylamine.
47
Easy
47 of 132
Remembering
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The reaction, is called:
View answer and explanation
Correct option: B
Mendius reaction
Option B (Mendius reaction) is correct because the reduction of a cyanide to a primary amine using Na/C2H5OH is known as the Mendius reaction.
48
Easy
48 of 132
Understanding
+4 | -1
Aliphatic amines are……basic than but aromatic amines are ……basic than .
View answer and explanation
Correct option: A
More, less
Option A (More, less) is correct because aliphatic amines are more basic than ammonia due to the +I effect of alkyl groups, while aromatic amines are less basic than ammonia due to resonance delocalization of the lone pair on nitrogen into the benzene ring.
49
Medium
49 of 132
Analyzing
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Arrange the following in increasing order of their basic strength?
p-nitroaniline (1); m-nitroaniline (2); 2,6-trimethylaniline(3); 3-methylanline(4).
p-nitroaniline (1); m-nitroaniline (2); 2,6-trimethylaniline(3); 3-methylanline(4).
View answer and explanation
Correct option: D
Option D () is correct because electron-donating groups increase basicity and electron-withdrawing groups decrease it.
50
Easy
50 of 132
Understanding
+4 | -1
In the reaction, is
View answer and explanation
Correct option: B
Option B () is correct because the reaction of a primary amine with nitrous acid produces nitrogen gas.
51
Medium
51 of 132
Understanding
+4 | -1
When aniline is heated with benzaldehyde, the product is:
View answer and explanation
Correct option: B
Schiff’s base
Option B (Schiff’s base) is correct because aniline reacts with benzaldehyde to form a Schiff's base.
52
Easy
52 of 132
Remembering
+4 | -1
The following turns brown on exposure to air and light
View answer and explanation
Correct option: C
Aniline
Option C (Aniline) is correct because aniline is known to turn brown upon exposure to air and light due to oxidation.
53
Medium
53 of 132
Remembering
+4 | -1
Urotropine has the composition:
View answer and explanation
Correct option: C
Option A () is correct because the chemical formula for urotropine (hexamethylene tetramine) is .
54
Easy
54 of 132
Analyzing
+4 | -1
Which of the following is most basic in nature?
View answer and explanation
Correct option: C
Option C () is the most basic because dialkyl amines are generally more basic than monoalkyl amines and ammonia due to the +I effect of the alkyl groups, and steric hindrance is not as significant as in trialkyl amines in aqueous solution.
55
Hard
55 of 132
Analyzing
+4 | -1
Under which of the following reaction conditions, aniline gives -nitroderivative as the major product?
I. Acetyl chloride/pyridine followed by reaction with conc. conc. .
II. Acetic anhydride/pyridine followed by conc. conc. .
III. Dil. followed by reaction with conc. conc. .
IV. Reaction with conc. conc. .
I. Acetyl chloride/pyridine followed by reaction with conc. conc. .
II. Acetic anhydride/pyridine followed by conc. conc. .
III. Dil. followed by reaction with conc. conc. .
IV. Reaction with conc. conc. .
View answer and explanation
Correct option: A
I and II
Option A (I and II) is correct because acetylation protects the amino group of aniline, directing the nitration to the para position.
56
Medium
56 of 132
Analyzing
+4 | -1
Assertion: Tert Butyl amine can be formed by Gabriel phthalimide synthesis
Reason: It follow mechanism
Reason: It follow mechanism
View answer and explanation
Correct option: D
If both the Assertion and Reason are incorrect.
Option D is correct. The assertion is incorrect because tert-butyl amine cannot be synthesized by the Gabriel phthalimide synthesis due to steric hindrance. The reason is also incorrect because the reaction does not follow an SN1 mechanism.
57
Medium
57 of 132
Understanding
+4 | -1
Which one of the following does not react with Heinsberg reagent.
View answer and explanation
Correct option: A
Option A () is correct because tertiary amines do not have a replaceable hydrogen atom on the nitrogen and thus cannot react with Hinsberg's reagent.
58
Medium
58 of 132
Remembering
+4 | -1
The discovery that shocked the vital force theory was:
View answer and explanation
Correct option: C
Wӧhler’s synthesis of urea from
Option C (Wöhler’s synthesis of urea from ) is correct because it disproved the vital force theory by synthesizing an organic compound from inorganic materials.
59
Easy
59 of 132
Remembering
+4 | -1
Mendius method of preparation of amines consists of:
View answer and explanation
Correct option: A
Catalytic reduction of alkyl cyanides
Option A (Catalytic reduction of alkyl cyanides) is correct because the Mendius method involves the reduction of alkyl cyanides to primary amines.
60
Hard
60 of 132
Analyzing
+4 | -1
An aromatic amine was treated with alcoholic potash and another compound when a foul smeling gas was formed with formula . was formed by reacting a compound with in the presence of slaked lime. Compound is:
View answer and explanation
Correct option: C
The correct answer is C () because it leads to the formation of chloroform, which reacts with the amine to form phenyl isocyanide.
Revision notes and key takeaways
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Showing 31-60 of 132 questions
