BHU PMT BHU PMT (Screening) Solved Paper-2007

  • question_answer
    During Lassaigne's test N and S present in an organic compound changes into

    A) \[N{{a}_{2}}S\]and\[NaCN\]

    B) \[NaSCN\]

    C) \[N{{a}_{2}}S{{O}_{4}}\]and\[NaCN\]

    D)  \[N{{a}_{2}}S\]and\[NaCN\]

    Correct Answer: A

    Solution :

                     If both N and S are present, it may result in the formation of\[NaCNS\]during fusion with sodium metal\[Na+C+N+S\xrightarrow[{}]{{}}NaCN\] If sodium metal is present in excess, the sulphocyanide  formed  decomposes  into sulphide and cyanide. \[NaCNS+2Na\xrightarrow[{}]{{}}NaCN+N{{a}_{2}}S\]


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