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Which of the following transformations c...

Which of the following transformations can be carried out by using HI as a rducing agent, under acidic conditions ?
`["Given: " I_(2)(S)rarr2I^(-)E^(theta)=0.54" V"]`
(i) `Cu^(+)rarrCu(S)" "E^(theta)=0.52" V"`
(ii) `Cr^(3+)rarrCr^(2+)" "E^(theta)=-0.41" V"`
(iii) `Fe^(3+)rarrFe^(2+)" "E^(theta)=-0.77" V"`
(iv) `Fe^(2+)rarrFe(s)" "E^(theta)=-0.44" V"`

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