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NEET CHEMISTRYAminesMedium

Question

In the reaction, CH3CN+2H→HClSnCl2X→boilingH2OYCH_3CN + 2H \xrightarrow[HCl]{SnCl_2} X \xrightarrow{boiling H_2O} Y the term Y is:

A

Acetone

B

Ethanamine

C

Acetaldehyde

D

Dimethyl amine

Step-by-Step Solution

The reaction sequence shown is the Stephen reaction, used for the preparation of aldehydes from nitriles (cyanides).

  1. Reduction: Methyl cyanide (CH3CNCH_3CN) is partially reduced by stannous chloride (SnCl2SnCl_2) in the presence of hydrochloric acid (HClHCl) to form an imine hydrochloride intermediate (X). CH3CN+2[H]+HCl→SnCl2CH3CH=NH⋅HCl (Acetaldimine hydrochloride)CH_3CN + 2[H] + HCl \xrightarrow{SnCl_2} CH_3CH=NH \cdot HCl \text{ (Acetaldimine hydrochloride)}
  2. Hydrolysis: The imine intermediate (X) undergoes hydrolysis with boiling water to yield acetaldehyde (Y). CH3CH=NH⋅HCl+H2O→ΔCH3CHO+NH4ClCH_3CH=NH \cdot HCl + H_2O \xrightarrow{\Delta} CH_3CHO + NH_4Cl Thus, Y is Acetaldehyde (CH3CHOCH_3CHO).

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.

CHEMISTRYAminesreactionxrightarrowhclsnclxrightarrowboiling

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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. $H_2SO_4$
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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.$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$
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