RAJASTHAN ­ PET Rajasthan PET Solved Paper-2009

  • question_answer
    The reaction of\[{{C}_{2}}{{H}_{5}}Cl\]with\[Li\]and\[CuI\]gives mainly

    A)  2-butene         

    B)  1, 3-butadiene

    C)  n-butane         

    D)  n-butyl chloride

    Correct Answer: C

    Solution :

     Alkyl halide reacts with\[Li\]and\[CuI\]in the presence of ether to give lithium dialkyl cuprate which further reacts with alkyl halide to give alkane. This reaction is called Corey-House reaction. \[{{C}_{2}}{{H}_{5}}Cl+2Li\xrightarrow[{}]{Ether}{{C}_{2}}{{H}_{5}}Li+LiBr\] \[2{{C}_{2}}{{H}_{5}}Li+CuI\xrightarrow[-Lil]{{}}\underset{lithium\text{ }dialkyl\text{ }cuprate}{\mathop{Li{{({{C}_{2}}{{H}_{5}})}_{2}}Cu}}\,\] \[Li{{({{C}_{2}}{{H}_{5}})}_{2}}Cu+{{C}_{2}}{{H}_{5}}Cl\xrightarrow[{}]{{}}\]      \[\underset{n-butane}{\mathop{{{C}_{2}}{{H}_{5}}-{{C}_{2}}{{H}_{5}}}}\,+{{C}_{2}}{{H}_{5}}Cu+LiCl\]


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