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  • Answer please! The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

The compound formed in the positive test for  nitrogen with the Lassaigne solution of an organic compound is

  • Option 1)

    Fe_{4}\left [ Fe(CN)_{6} \right ]_{3}\;

  • Option 2)

    \; \; Na_{3}\left [ Fe(CN)_{6} \right ]\; \;

  • Option 3)

    \;Fe(CN)_{3} \; \;

  • Option 4)

    \;Na_{4}\left [ Fe(CN)_{5} \right NOS

 

Answers (1)

best_answer

As we learnt ,

 

Lassaigne's Test for Nitrogen -

Lassaigne's solution + FeSO4 + dil H2SO4 -----------> Prussian blue color indicates the presence of nitrogen

- wherein

N-Present

 

 When we do the Lassaigne test for Nitrogen , following reactions takes place :

FeSO4 + NaOH \rightarrow Fe(OH)2 + Na2SO4

6 NaCN + Fe(OH)2 \rightarrow Na4[Fe(CN)6]

3 Na4[Fe(CN)6] + 4 FeCl3 \rightarrow Fe4[Fe(CN)6]3 + 12 NaCl

                                                Ferric ferrocyanide

                                                 ( Prussian blue)

 


Option 1)

Fe_{4}\left [ Fe(CN)_{6} \right ]_{3}\;

Option 2)

\; \; Na_{3}\left [ Fe(CN)_{6} \right ]\; \;

Option 3)

\;Fe(CN)_{3} \; \;

Option 4)

\;Na_{4}\left [ Fe(CN)_{5} \right NOS

Posted by

satyajeet

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