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प्रश्न
Amongst the given set of reactants, the most appropriate for preparing 2° amine is ______.
विकल्प
\[\ce{2° R - Br + NH3}\]
\[\ce{2° R - Br + NaCN followed by H2 /Pt}\]
\[\ce{1° R - NH2 + RCHO followed by H2/Pt}\]
\[\ce{1° R - Br (2 mol) + potassium phthalimide followed by H3O+/heat}\]
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उत्तर
Amongst the given set of reactants, the most appropriate for preparing 2° amine is \[\ce{1° R - NH2 + RCHO followed by H2/Pt}\].
Explanation:
\[\ce{\underset{1° Amine}{R - NH2} + \underset{Aldehyde}{O = HCR} ->[Reductive][amination] R - N - CHR ->[H2/Pt][Reduction] \underset{2° Amine}{RNH - CH2R}}\]
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संबंधित प्रश्न
Write a short note on Hoffmann bromamide degradation.
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Identify the INCORRECT statement regarding Hofmann bromamide reaction.
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?
In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one \[\ce{CH2}\] group in the carbon chain, the reagent used as source of nitrogen is ______.
The source of nitrogen in Gabriel synthesis of amines is ______.
Among the following amines, the strongest Brönsted base 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) \[\ce{LiAlH4}\]
How will you bring out the following conversion?
Match the reactions given in Column I with the statements given in Column II.
| Column I | Column II | ||
| (i) | Ammonolysis | (a) | Amine with lesser number of carbon atoms |
| (ii) | Gabriel phthalimide synthesis | (b) | Detection test for primary amines. |
| (iii) | Hoffmann Bromamide reaction | (c) | Reaction of phthalimide with \[\ce{KOH}\] and \[\ce{R-X}\] |
| (iv) | Carbylamine reaction | (d) | Reaction of alkylhalides with \[\ce{NH3}\] |
Assertion: Aromatic 1° amines can be prepared by Gabriel Phthalimide Synthesis.
Reason: Aryl halides undergo nucleophilic substitution with anion formed by phthalimide.
Account for the following:
Aniline cannot be prepared by the ammonolysis of chlorobenzene under normal conditions.
In the given reaction what is the X?
\[\begin{array}{cc}
\ce{O}\phantom{.......................}\\
||\phantom{.......................}\\
\phantom{}\ce{R - C - OH <-[H3O] Χ ->[H] RCH2NH2}
\end{array}\]
Which of the following amines can be prepared by Gabriel phthalimide reaction?
Identify the product ‘C’ in the following reaction.
\[\ce{Aniline ->[(CH3CH)2O][Pyridine] A ->[Br2][CH3COOH] B ->[H^+ or OH^-] C}\]
Write short note on the following:
Ammonolysis
Write a short note on Ammonolysis.
