English

Why cannot aniline be prepared by Gabriel phthalimide synthesis? - Chemistry

Advertisements
Advertisements

Question

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

Long Answer
Advertisements

Solution

  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
  Is there an error in this question or solution?
Chapter 13: Amines - Long answer questions

APPEARS IN

SCERT Maharashtra Chemistry [English] 12 Standard HSC
Chapter 13 Amines
Long answer questions | Q 1.2

RELATED QUESTIONS

How is ethyl amine prepared from methyl iodide?


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 :


How do you convert the following: C6H5CONH2 to C6H5NH2


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


Accomplish the following conversion:

Nitrobenzene to benzoic acid


Accomplish the following conversion:

Benzyl chloride to 2-phenylethanamine


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

\[\ce{C6H5NO2 ->[Fe/HCl] A ->[HNO2][273 K] B ->[C6H5OH] C}\]


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


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


Identify 'A' and 'B' in the following reaction and rewrite the complete reaction :


Arrange the following in the increasing order of their pKvalues:

C6H5NH2, C2H5NH2, C6H5NHCH3


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


Answer the following

Identify A and B in the following reactions.

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


Answer the following

Explain Gabriel phthalimide synthesis.


Mendius reaction is used to convert _____________


Name the process of breaking C-X bond by ammonia in preparation of amines.


Write reactions to bring about the following conversions.

Acetamide to Ethylamine


Explain the following reaction with a suitable example.

Hofmann elimination reaction


Identify the product 'A' in the following reaction.

\[\ce{Aniline ->[(CH3CO)2O][Pyridine] A}\]


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?


\[\ce{CH3-CN ->[Na/C2H5OH]}\]

The product formed is ____________.


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


In aqueous phase the order of basic strength of alkylamine is ______.


Identify product B in the following reaction.

\[\ce{Aniline ->[NaNO2][HCl] A ->[KI] B}\]


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


Which of the following reactions does NOT yield an amine?


Quaternary ammonium salt is formed:


Benzylamine may be alkylated as shown in the following equation:

\[\ce{C6H5CH2NH2 + R - X -> C6H5CH2NHR}\]

Which of the following alkylhalides is best suited for this reaction through SN1 mechanism?


The source of nitrogen in Gabriel synthesis of amines is ______.


Reduction of aromatic nitro compounds using \[\ce{Fe}\] and \[\ce{HCl}\] gives ______.


Which of the following compounds is the weakest Brönsted base?


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) \[\ce{LiAlH4}\]


Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?

(i) Acetyl chloride/pyridine followed by reaction with conc.\[\ce{H2SO4 }\] + conc. \[\ce{HNO3}\].

(ii) Acetic anyhdride/pyridine followed by conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].

(iii) Dil. HCl followed by reaction with conc.\[\ce{H2SO4}\] + conc.\[\ce{HNO3}\].

(iv) Reaction with conc.\[\ce{HNO3}\] + conc.\[\ce{H2 SO4}\].


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


Identify A and B in the following reaction.


How will you carry out the following conversion?


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 compound X is which of the following?

\[\ce{CH3CN ->[Na + C2H5OH] x}\]


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


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 reaction DOES NOT involve Hoffmann bromamide degradation?


Which of the following amines can be prepared by Gabriel phthalimide reaction?


What is the IUPAC name of \[\ce{(CH3)2 - N - CH3}\]?


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


Which of the following would not be a good choice for reducing nitrobenzene to aniline?


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

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


Write short note on the following:

Ammonolysis


Identify A and B in the following reaction.

\[\ce{C6H5CH2Br ->[Alco.][KCN] A ->[Na/Ethanol][reduction] B}\]


Write the name of reduction product formed when ethyl cyanide is treated with sodium and alcohol.


Write a short note on Ammonolysis.


Write short note on the following.

Ammonolysis.


Write a short note on Ammonolysis.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×