CMC Medical CMC-Medical VELLORE Solved Paper-2009

  • question_answer
    \[C{{H}_{2}}=C{{H}_{2}}\xrightarrow{HBr}X\xrightarrow{Aq.\,KOH}Y\xrightarrow[{{I}_{2}}]{N{{a}_{2}}C{{O}_{3}}}Z\] In the above reaction sequence, Z is

    A)  \[{{C}_{2}}{{H}_{5}}OH\]                             

    B)  \[{{C}_{2}}{{H}_{5}}I\]

    C)  \[C{{H}_{3}}CHO\]                         

    D)  \[CH{{I}_{3}}\]

    Correct Answer: D

    Solution :

                    \[C{{H}_{2}}=C{{H}_{2}}+HBr\xrightarrow{{}}\underset{X}{\mathop{C{{H}_{3}}-C{{H}_{2}}Br}}\,\] \[\underset{X}{\mathop{C{{H}_{3}}C{{H}_{2}}Br}}\,\xrightarrow[-KBr]{Aq.KOH}\underset{Y}{\mathop{\underset{ethyl\,alcohol}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,}}\,\] \[C{{H}_{3}}C{{H}_{2}}OH+N{{a}_{2}}C{{O}_{3}}+{{I}_{2}}\xrightarrow[(idoform\,test)]{}\underset{Z}{\mathop{\underset{iodoform}{\mathop{CH{{I}_{3}}}}\,}}\,\]                \[+HCOONa+NaI+C{{O}_{2}}+{{H}_{2}}O\]


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