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  4. The reaction, CH3CH2Cl xrightarrow[(ii) CuI](i) Li xrightarrowCH3CH2Cl n-butane is known as

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Q. The reaction, $ C{{H}_{3}}C{{H}_{2}}Cl\xrightarrow[(ii)\,\,CuI]{(i)\,Li}\xrightarrow{C{{H}_{3}}C{{H}_{2}}Cl} $ n-butane is known as

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Solution:

The reaction in which first, an alkyl halide reacts with lithium and $ CuI $ to give lithium dialkyl cuprate which on further reaction with alkyl halide, gives alkane, is known as Corey-House synthesis. $ C{{H}_{3}}C{{H}_{2}}Cl\xrightarrow[-LiCl]{Li}C{{H}_{3}}C{{H}_{2}}Li\xrightarrow{CuI} $ $ {{(C{{H}_{3}}C{{H}_{2}})}_{2}}CuLi $ $ \xrightarrow{C{{H}_{3}}C{{H}_{2}}Cl}\underset{n-bu\tan e}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,+C{{H}_{3}}C{{H}_{2}}Cu+LiCl $