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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

  • question_answer
    Identify the compounds \[A\] and \[B\] in the following reaction sequence. \[Ca{{C}_{2}}(s)+{{H}_{2}}O(l)\xrightarrow{{}}A(g)\xrightarrow[HgS{{O}_{4}}]{{{H}_{2}}S{{O}_{4}}}B(l)\]

    A)  \[A\]is ethylene, \[B\] is acetaldehyde

    B)         \[A\]is acetylene, \[B\] is propionaldehyde

    C)         \[A\]is ethane, \[B\] is ethanol

    D)         \[A\]is acetylene, \[B\] is acetaldehyde

    Correct Answer: D

    Solution :

    \[Ca{{C}_{2}}(s)+2{{H}_{2}}O(l)\xrightarrow{{}}\underset{\begin{smallmatrix}  (A) \\  \downarrow {{H}_{2}}S{{O}_{4}}/HgS{{O}_{4}} \end{smallmatrix}}{\mathop{HC\equiv CH}}\,+Ca{{(OH)}_{2}}\]\[C{{H}_{3}}-CHOC{{H}_{2}}=\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{C}}\,H\]


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