NEET Sample Paper NEET Sample Test Paper-19

  • question_answer 62) When primary amine is heated with \[C{{S}_{2}}\]in the presence of excess of mercuric chloride, it produces isothiocyanate. This reaction is known as

    A)  Carbylamine reaction

    B)  Hofmann bromamide reaction

    C)  Hofmann mustard oil reaction

    D)  Hinsberg's reaction

    Correct Answer: C

    Solution :

    p-amines react with \[C{{S}_{2}}\]in the presence of \[HgC{{l}_{2}}\]to give isothiocyanates having a characteristic smell of mustard oil and the reaction is called Hofmann's mustard oil reaction. \[R-N{{H}_{2}}+C{{S}_{2}}\xrightarrow{HgC{{l}_{2}}}\underset{\text{Isothiocyante}}{\mathop{RN=C=S}}\,+HgS+2HCl\] \[(R=alkyl\,or\,aryl)\] Hence, the correct option is [c].

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