12th Class Chemistry Nitrogen Containing Compounds Question Bank 12th CBSE Chemistry Nitrogen Containing Compounds

  • question_answer
    It is difficult to prepare pure amine by the ammonolysis of alkyl halides. Explain.

    Answer:

                    The ammonolysis of alkyl halides with ammonia is a nucleophilic substitution reaction in which ammonia acts as anucleophile by donating the electron pair on nitrogen atom to form primary amine as the initial product. Now, the primary amine can act as nucleophile and combine with alkyl halide (if available) to give secondary amine and the reaction continues in the same way to form tertiary amine and finally quaternary ammonium salt. Thus, a mixture of products is formed and it is not possible to separate individual amines from the mixture. \[\underset{\begin{smallmatrix}   \\  \text{Alkyl}\,\,\text{halide} \end{smallmatrix}}{\mathop{R-X}}\,\xrightarrow[-HX]{\overset{\centerdot \,\centerdot }{\mathop{N}}\,{{H}_{3}}}\,R-\overset{\centerdot \,\centerdot }{\mathop{N}}\,{{H}_{2}}\,\xrightarrow[-HX]{R-X}\,\] \[{{R}_{2}}\overset{\centerdot \,\centerdot }{\mathop{N}}\,H\xrightarrow[-HX]{R-X}{{R}_{3}}\overset{\centerdot \,\centerdot }{\mathop{N}}\,\,\xrightarrow{R-X}\,{{R}_{4}}\overset{+}{\mathop{N}}\,{{X}^{-}}\]


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