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# Which of the following alkali metals has the highest tendency for the half reaction? $M(g)\rightarrow M^+(g)+e^-$

$\begin{array}{1 1}(a)\;\text{Sodium}&(b)\;\text{Lithium}\\(c)\;\text{Potassium}&(d)\;\text{Calcium}\end{array}$

Lithium has high IE among alkali metals.
Hence (b) is the correct answer.