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NEET CHEMISTRYAminesMedium

Question

A nitro-compound among the following that does not react with nitrous acid is:

A

Primary nitroalkane

B

Secondary nitroalkane

C

Nitromethane

D

Tertiary nitroalkane (e.g., (CH3)3C−NO2(CH_3)_3C-NO_2)

Step-by-Step Solution

The reaction of nitroalkanes with nitrous acid (HNO2HNO_2) depends on the presence of α\alpha-hydrogen atoms. Primary nitro compounds (having two α\alpha-hydrogens) react to form nitrolic acids, which dissolve in alkali to give a red solution. Secondary nitro compounds (having one α\alpha-hydrogen) react to form pseudonitrols, which give a blue colour. Tertiary nitro compounds (R3C−NO2R_3C-NO_2) do not have any α\alpha-hydrogen atoms attached to the carbon bearing the nitro group, and therefore, they do not react with nitrous acid.

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.

CHEMISTRYAminesnitrocompoundfollowingnitrous

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

A.p-Aminophenol
B.Azoxybenzene
C.Azobenzene
D.Aniline
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The reagent required to convert acetamide into methyl amine is:

A.$NaOH/Br_2$
B.Sodalime
C.Hot conc. $H_2SO_4$
D.$PCl_5$
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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)
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D.Option 4 (Missing)
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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
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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.$(CH_3)_2NH > (CH_3)_3N > CH_3NH_2$
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