Which of the following is correct ? (i...

Which of the following is correct ?
(i) Lithium is better reducing agent than sodium
(ii) Sodium is better reducing agent than potassium
(iii) Rubidium is better reducing agent than sodium
(iv) The Rubidium is better reducing agent than lithium

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Which is the best reducing agent ?

`F^(-)`

`I_(2)`

`Br_(2)`

`I^(-)`

`NaHCO_(3)`

`NaHSO_(3)`

`Na_(2)O_(2)`

`NaHSO_(4)`

`F^(-)`

`Cl^(-)`

`Br^(-)`

`I^(-)`