Which of the following order is correct of reducing strength in water-

C s > R b > K > N a > L i

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L i > N a > K > R b > C s

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L i > C s > R b > K > N a

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None of these

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Solution

The correct option is C $L i > C s > R b > K > N a$
Order of reducing power increases as we move down the group. However, Li due to its high hydration energy of its cation is the strongest reducing alkali metals.

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