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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

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प्रश्न

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

दीर्घउत्तर
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उत्तर

  1. Gabriel phthalimide synthesis is used for the preparation of aliphatic primary amines.
  2. It involves the nucleophilic substitution of alkyl halides by the anion formed by the phthalimide.
  3. But aryl halides do not undergo nucleophilic substitution with the anion formed by the phthalimide.
    Hence, aniline cannot be prepared by Gabriel phthalimide synthesis.
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पाठ 13: Amines - Long answer questions

संबंधित प्रश्‍न

Write a short note on Hoffmann bromamide degradation.


An aromatic compound 'A' of molecular formula C7H7ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions :


Give the structures of A, B and C in the following reactions :


Accomplish the following conversion:

Benzamide to toluene


Give the structure of A, B and C in the following reaction:

\[\ce{C6H5N2Cl ->[CuCN] A ->[H2O/H+] B ->[NH3][\Delta] C}\]


Give the structure of A, B and C in the following reaction:

\[\ce{CH3CH2Br ->[KCN] A ->[LiAlH4] B ->[HNO2][0^\circ C] C}\]


Write the reaction of aromatic primary amine with nitrous acid.


Write the reaction of aliphatic primary amine with nitrous acid.


Explain the mechanism of action of hydroiodic acid on 3-methylbutan-2-ol.


Give the structures of A, B and C in the following reactions :


Give the structures of A, B and C in the following reactions :


 Write structures of compounds A and B in each of the following reactions:


Answer in one sentence.

Which amide does produce ethanamine by Hofmann bromamide degradation reaction?


Answer in one sentence.

Predict the product of the following reaction.

\[\ce{Nitrobenzene ->[Sn/conc.HCl]?}\]


Answer the following

Explain Gabriel phthalimide synthesis.


Write reactions to prepare ethanamine from Acetonitrile.


Mendius reaction is used to convert _____________


Explain Hoffmann’s exhaustive alkylation with suitable reactions.


Identify the product obtained, when benzamide is treated with bromine and aqueous sodium hydroxide.


What product is formed when \[\ce{R - C ≡ N}\] is hydrolysed?


What is the molar mass of the amine formed when acetamide undergoes Hofmann bromamide degradation?


Identify the INCORRECT statement regarding Hofmann bromamide reaction.


Which of the following does NOT give carbylamine test?


Which of the following reactions does NOT yield an amine?


Nitro compounds are reduced by iron scrap and hydrochloric acid to yield one of the following compounds:


The best reagent for converting 2–phenylpropanamide into 2-phenylpropanamine is ______.


Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?


The reagents that can be used to convert benzenediazonium chloride to benzene are:

(i) \[\ce{SnCl2/HCl}\]

(ii) \[\ce{CH3CH2OH}\]

(iii) \[\ce{H3PO2}\]

(iv) \[\ce{LiAlH4}\]


Which of the following amines can be prepared by Gabriel synthesis.

(i) Isobutyl amine

(ii) 2-Phenylethylamine

(iii) N-methylbenzylamine

(iv) Aniline


Which of the following reactions are correct?

(i)

(ii)

(iii)

(iv)


What is the product when \[\ce{C6H5CH2NH2}\] reacts with \[\ce{HNO2}\]?


What is the best reagent to convert nitrile to primary amine?


Write following conversions:

nitrobenzene `->` acetanilide


How will you carry out the following conversion?


A primary amine is formed by an amide on treatment with bromine and alkali. The primary amine has


Reduction of nitro alkanes yields which compound?


In the given reaction what is the X?

\[\begin{array}{cc}
\ce{O}\phantom{.......................}\\
||\phantom{.......................}\\
\phantom{}\ce{R - C - OH <-[H3O] Χ ->[H] RCH2NH2}
\end{array}\]


Acetamide and ethyl amide can be distinguished by reacting with.


C6H5CONHCH3 can be converted into C6H5CH2NHCH3 by:-


Which of the following CANNOT be prepared by ammonolysis of alkyl halide?


A compound 'A' on reduction with iron scrap and hydrochloric acid gives compound 'B' with molecular formula C6H7N. Compound 'B' on reaction with CHCl3 and alcoholic KOH produces an obnoxious smell of carbylamine due to the formation of 'C'. Identify 'A', 'B' and 'C' and write the chemical reactions involved.


Which of the following compound gives pink colour on reaction with phthalic anhydride in cone. H2SO4 followed by treatment with NaOH?


  1. Phenyl methenamine
  2. N, N - Dimethylaniline
  3. N - Methyl aniline
  4. Benzenamine

Choose the correct order of the basic nature of the above amines.


The amine 'A' when treated with nitrous acid gives yellow oily substance. The amine A is ______.


Write the name of the product formed by the action of LiAlH4/ether on acetamide.


Write a short note on the following:

Ammonolysis


Write short note on the following:

Ammonolysis


Write short note on the following.

Ammonolysis.


Write a short note on the following:

Ammonolysis.


Write short notes on the following:

Ammonolysis 


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