Among the following, the couple with most positive reduction potential is :

M n^{+ 3} / M n^{+ 2}

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C r^{+ 3} / C r^{+ 2}

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F e^{+ 3} / F e^{+ 2}

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C o^{+ 3} / C o^{+ 2}

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Solution

The correct option is A $M n^{+ 3} / M n^{+ 2}$
Due to stable half filled configuration, $M n^{+ 3}$ has high tendency to reduce into $M n^{+ 2}$ ( $d^{5}$ configuration). So, it has the highest reduction potential.

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