KVPY Sample Paper KVPY Stream-SX Model Paper-10

  • question_answer
    \[C{{H}_{3}}C{{H}_{2}}C1\xrightarrow{NaCN}X\xrightarrow{Ni/{{H}_{2}}}Y\xrightarrow[anhydridre]{Acetic}Z\] Z in the above reaction sequence is

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

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

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

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

    Correct Answer: A

    Solution :

    \[{{\operatorname{CH}}_{3}}C{{H}_{2}}Cl\xrightarrow{NaCN}C{{H}_{3}}{{\underset{\operatorname{X}}{\mathop{C{{H}_{2}}}}\,}_{{}}}CN\]
    \[{{\operatorname{CH}}_{3}}C{{H}_{2}}CN+NaCl\xrightarrow{Ni/{{H}_{2}}}\,{{\operatorname{CH}}_{3}}C{{H}_{2}}\underset{(Y)}{\mathop{C}}\,{{H}_{2}}N{{H}_{2}}\]
    \[{{\operatorname{CH}}_{3}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\xrightarrow{{{\left( C{{H}_{3}}CO \right)}_{2}}O}\] \[{{\operatorname{CH}}_{3}}C{{H}_{2}}C\underset{\operatorname{Y}}{\mathop{{{H}_{2}}}}\,NHCOC{{H}_{3}}+C{{H}_{3}}COOH\]


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