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# $R-L$------------>$R-X$. L is a good leaving group .The rate of the reaction is maximum when $Li-X$ is

$\begin{array}{1 1}(a)Li-F\\(b)Li-Cl\\(c)Li-Br\\(d)Li-I\end{array}$

The bond between Li-I is very week and broken easily than bond between Li-Cl ,Li-Br ,Li-F