मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

Advertisements
Advertisements

प्रश्न

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

दीर्घउत्तर
Advertisements

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.
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 13: Amines - Long answer questions

संबंधित प्रश्‍न

How is ethyl amine prepared from methyl iodide?


How do you convert the following: Ethanenitrile to ethanamine


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


Accomplish the following conversion:

Nitrobenzene to benzoic acid


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

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


Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?


Mention 'two' uses of propan-2-one.


Answer in one sentence.

Predict the product of the following reaction.

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


Answer the following

Identify A and B in the following reactions.

\[\ce{C6H5CH2Br->[alco.][KCN]A ->[Na/ethanol]B.}\]


Answer the following

Write a reaction to convert acetic acid into methylamine.


Answer the following

Explain the ammonolysis of alkyl halides.


Mendius reaction is used to convert _____________


Write reactions to bring about the following conversions.

Acetamide to methylamine


Acetamide on reduction using Na/C2H5OH gives ____________.


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


Which of the following amines exhibits maximum degree of intermolecular hydrogen bonding?


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?


Which of the following reactions is appropriate for converting benzamide to aniline?


Which of the following amines forms a clear solution when treated with benzene sulphonyl chloride and excess of potassium hydroxide?


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


The reduction of alkyl cyanide with sodium and ethanol to give primary amines is, ____________.


Which of the following amines cannot be prepared by Gabriel phthalimide synthesis?


Which of the following reagents is used in Hofmann's elimination reaction of amines?


Which of the following reactions does NOT yield an amine?


For producing amines, the reaction of nitro compounds with iron scrap is preferred because:


Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion (A): Alkyl halides are insoluble in water.

Reason (R): Alkyl halides have halogen attached to sp3 hybrid carbon.

Select the most appropriate answer from the options given below:


Amongst the given set of reactants, the most appropriate for preparing 2° amine is ______.


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?


Reduction of nitrobenzene by which of the following reagent gives aniline?

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

(ii) \[\ce{Fe/HCl}\]

(iii) \[\ce{H2 - Pd}\]

(iv) \[\ce{Sn/NH4OH}\]


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 reactions are correct?

(i)

(ii)

(iii)

(iv)


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


Suggest a route by which the following conversion can be accomplished.


Assertion: Only a small amount of \[\ce{HCl}\] is required in the reduction of nitro compounds with iron scrap and \[\ce{HCl}\] in the presence of steam.

Reason: \[\ce{FeCl2}\] formed gets hydrolysed to release \[\ce{HCl}\] during the reaction.


The Gabriels' phthalimide synthesis is used in the synthesis of


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


Which of the following compound is expected to be most basic?


C6H5CONHCH3 can be converted into C6H5CH2NHCH3 by:-


When primary amines are treated with HCl, the product obtained is which of the following?


Methyl amine on reaction with chloroform in the presence of NaOH gives ______.


Which of the following statement(s) is/are incorrect in case of Hofmann bromamide degradation?


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


Amides can be converted into amines by the reaction named ______.


Identify the compo ds A and B in the following reactions:

\[\ce{A ->[Nitrating mixture] B ->[(i) Sn/cone. HCI][(ii) NaOH] Aniline}\]


Write a short note on the following:

Ammonolysis


Write a short note on Ammonolysis.


Assertion: Amimonolysis of alkyl halides involves the reaction between alkyl halides and alcoholic ammonia.

Reason: Ammonolysis of alkyl halides produces secondary amines only.


Write short notes on the following:

Ammonolysis 


Write a short note on the following:

Ammonolysis


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×