BCECE Engineering BCECE Engineering Solved Paper-2004

  • question_answer
    X compounds reacts with Na to give \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}},\] then compound X is:

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

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

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

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

    Correct Answer: B

    Solution :

    Key Idea: This is Wurtz reaction. In this reaction two molecules of alkyl halide react with each other to form alkane having double the number of carbon atoms. \[\underset{\text{ethyl}\,\text{chloride}}{\mathop{\underset{(x)}{\mathop{2C{{H}_{3}}C{{H}_{2}}Cl}}\,}}\,+2Na\xrightarrow{{}}\]                                                 \[\underset{\text{butane}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,+2NaCl\]


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