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JEE Main & Advanced Chemistry Carboxylic Acids Question Bank Preparation of Carboxylic Acids and Their Derivatives

  • question_answer
    \[{{(C{{H}_{3}})}_{2}}CO\underset{(HCl)}{\mathop{\xrightarrow{NaCN}}}\,A\underset{\Delta }{\mathop{\xrightarrow{{{H}_{3}}{{O}^{+}}}}}\,B\] In the above sequence of reactions A and B are          [CPMT 2000]

    A)                 \[{{(C{{H}_{3}})}_{2}}C(OH)CN,\,{{(C{{H}_{3}})}_{2}}C(OH)COOH\]

    B)                 \[{{(C{{H}_{3}})}_{2}}C(OH)CN,\,{{(C{{H}_{3}})}_{2}}C{{(OH)}_{2}}\]

    C)                 \[{{(C{{H}_{3}})}_{2}}C(OH)CN,\,{{(C{{H}_{3}})}_{2}}CHCOOH\]

    D)                 \[{{(C{{H}_{3}})}_{2}}C(OH)CN,{{(C{{H}_{3}})}_{2}}C=O\]

    Correct Answer: A

    Solution :

               \[\begin{matrix}    C{{H}_{3}}  \\    C{{H}_{3}}  \\ \end{matrix}>C=O\underset{(HCl)}{\mathop{\xrightarrow{NaCN}}}\,\]\[\underset{(\text{A})}{\mathop{\begin{matrix}    C{{H}_{3}}  \\    C{{H}_{3}}  \\ \end{matrix}>C<\,\,\begin{matrix}    OH  \\    CN  \\ \end{matrix}}}\,\]\[\underset{\Delta }{\mathop{\xrightarrow{H_{3}^{+}O}}}\,\underset{(B)}{\mathop{\begin{matrix}    C{{H}_{3}}  \\    C{{H}_{3}}  \\ \end{matrix}>C<\begin{matrix}    OH\,\,\,\,\,  \\    \ COOH  \\ \end{matrix}}}\,\]


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