JEE Main & Advanced JEE Main Paper (Held On 11-Jan-2019 Evening)

  • question_answer
    A compound X on treatment with \[B{{r}_{2}}/NaOH,\]provided \[{{C}_{3}}{{H}_{9}}N,\]which gives positive carbylamine test. Compound X is

    A) \[C{{H}_{3}}CON{{(C{{H}_{3}})}_{2}}\]                   

    B) \[C{{H}_{3}}COC{{H}_{2}}NHC{{H}_{3}}\]

    C) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CON{{H}_{2}}\]           

    D) \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{2}}N{{H}_{2}}\]

    Correct Answer: C

    Solution :

    As carbylamine test is given by primary amines only thus \[{{C}_{3}}{{H}_{9}}N\]should be a primary amine. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\]or\[C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  N{{H}_{2}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}\] Amide gives primary amine on reaction with \[B{{r}_{2}}/NaOH.\] Thus, X is \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CON{{H}_{2}}.\]


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