(CH_3)_2CHBr xrightarrow[(2) CuI]{(1) Li} (A) | vedclass

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(C) The reaction is a Corey-House synthesis,which is used to prepare alkanes by coupling an alkyl halide with a lithium dialkylcuprate (Gilman reagent

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$(CH_3)_2CHCH_2CH(CH_3)_2$

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(C) The reaction is a Corey-House synthesis,which is used to prepare alkanes by coupling an alkyl halide with a lithium dialkylcuprate (Gilman reagent).Step $1$: Formation of Gilman reagent $(A)$.$2(CH_3)_2CHBr + 4Li \rightarrow 2(CH_3)_2CHLi + 2LiBr$$2(CH_3)_2CHLi + CuI \rightarrow [(CH_3)_2CH]_2CuLi + LiI$So,$(A)$ is the Gilman reagent $[(CH_3)_2CH]_2CuLi$.Step $2$: Coupling reaction.$[(CH_3)_2CH]_2CuLi + (CH_3)_2CHCH_2Br \rightarrow (CH_3)_2CH-CH_2CH(CH_3)_2 + (CH_3)_2CHCu + LiBr$The product $B$ is $2,4$-dimethylpentane,which is $(CH_3)_2CHCH_2CH(CH_3)_2$.

$(CH_3)_2CHBr$ $\xrightarrow[(2) CuI]{(1) Li} (A)$ $\xrightarrow{(CH_3)_2CHCH_2Br} B$.
$'B'$ is

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$(CH_3)_2CHBr$ $\xrightarrow[(2) CuI]{(1) Li} (A)$ $\xrightarrow{(CH_3)_2CHCH_2Br} B$. $'B'$ is