In the following reaction ,
`R_2CuLi overset(R'X)(to)R-R'+Rcu + LiX`
Nature of R and R' should be

Options

A. Any alkyl, `2^@` alkyl
B. Any alkyl, methyl/`1^@ "alkyl/"2^@` cycloalkyl
C. `1^@ "alkyl, methyl/"1^@"alkyl/"2^@`cycloalkyl
D. `2^@` alkyl, any alkyl

Answer

C

Explanation

The synthesis is called corey house synthesis and for good yield of R-R', R'X should be `1^@` alkylhalide (also methyl) `2^@` alkylhalide , cycloalkyhalide .