The best method for the preparation of 2,2-dimethylbutane is via the reaction of:

{M e}_{3} C B r

and

M e {C H}_{2} B r

N a /

ether

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{({M e}_{3} C)}_{2} C u L i

and

M e {C H}_{2} B r

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{(M e {C H}_{2})}_{2} C u L i

and

{M e}_{3} C B r

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{M e}_{3} C M g I

and

M e {C H}_{2} I

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Solution

The correct option is B ${({M e}_{3} C)}_{2} C u L i$ and $M e {C H}_{2} B r$
2,2-dimethyl butane is prepared from Corey-House alkane synthesis

${({M e}_{3} C)}_{2} C u L i + M e {C H}_{2} B r S_{N} 2 - - \to {M e}_{3} C - {C H}_{2} {C H}_{3} + B r M e_{3} C - C u L i$

So, the correct option is $B$

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