Among following alkali metals, which element is the least powerful reducing agent?

N a

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C s

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L i

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K

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Solution

The correct option is B $N a$
The alkali metals are strong reducing agent due to there tendency to lose electron.
The reducing strength increases down the group.
However the reducing strength of $L i$ is more thant that of $N a$ due to the higher hydration energy of $L i$ .
Thus the correct order will be:
$L i > N a < K < R b < C s$
Thus, least powerful reducing agent is $N a$ .

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