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NEET CHEMISTRYAminesMedium

Question

Mark the reaction that does not yield aniline from the given options:

A

Hydrolysis of phenyl isocyanide with an acidic solution

B

Degradation of benzamide with bromine in alkaline solution

C

Reduction of nitrobenzene with H2/PdH_2/Pd in ethanol

D

Treatment of potassium salt of phthalimide with chlorobenzene followed by hydrolysis in an aqueous NaOH solution

Step-by-Step Solution

Gabriel phthalimide synthesis is used for the preparation of primary aliphatic amines. It cannot be used for the preparation of primary aromatic amines (like aniline) because aryl halides (such as chlorobenzene) do not undergo nucleophilic substitution with the anion formed by phthalimide due to the resonance stabilization and partial double bond character of the C-Cl bond.

Other reactions:

  1. Hydrolysis of phenyl isocyanide with an acidic solution yields aniline and formic acid.
  2. Hofmann bromamide degradation of benzamide with bromine in an alkaline solution yields aniline.
  3. Catalytic reduction of nitrobenzene with H2/PdH_2/Pd in ethanol yields aniline.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Amines. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAminesreactionanilineoptions

More Amines Questions

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The products formed when Aniline reacts with $Br_2$ water, and $NaNO_2/HCl$ will be, respectively:

A.p-Bromoaniline; p-Chloroaniline
B.2,4,6-Tribromoaniline; p-Chloroaniline
C.2,4,6-Tribromoaniline; Benzenediazonium chloride
D.p-Bromoaniline; Benzenediazonium chloride
MediumSolve

Aniline gives a set of the following reactions that yielded a coloured product 'Y'. The structure of 'Y' is: (Note: Reaction scheme is missing from the provided text)

A.Option 1
B.Option 2
C.Option 3
D.Option 4
MediumSolve

The structure of C in the below-mentioned reaction is: (Note: Reaction scheme is missing from the provided text)

A.Option 1
B.Option 2
C.Option 3
D.Option 4
MediumSolve

What results from the electrolytic reduction of nitrobenzene in a highly acidic medium?

A.p-Aminophenol
B.Azoxybenzene
C.Azobenzene
D.Aniline
MediumSolve

The reagent required to convert acetamide into methyl amine is:

A.$NaOH/Br_2$
B.Sodalime
C.Hot conc. $H_2SO_4$
D.$PCl_5$
EasySolve

D is N-methyl aniline in the given below sequence of reaction: $A \xrightarrow{\text{reduction}} B \xrightarrow{CHCl_3/KOH} C \xrightarrow{\text{reduction}} D$. Structure of A can be:

A.Option 1 (Missing)
B.Nitrobenzene
C.CH3NH2
D.Option 4 (Missing)
MediumSolve

Which of the following statements about primary amines is false?

A.Alkyl amines are stronger bases than aryl amines
B.Alkyl amines react with nitrous acid to produce alcohols
C.Aryl amines react with nitrous acid to produce phenols
D.Alkyl amines are stronger bases than ammonia
MediumSolve

What is the correct order of the methyl-substituted amines' basic strength in an aqueous solution?

A.$CH_3NH_2 > (CH_3)_2NH > (CH_3)_3N$
B.$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$
C.$(CH_3)_3N > CH_3NH_2 > (CH_3)_2NH$
D.$(CH_3)_2NH > (CH_3)_3N > CH_3NH_2$
MediumSolve

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