Which is the poorest reducing agent?

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(C) The reducing power of hydrogen species depends on their reactivity. $1$. Nascent hydrogen is highly reactive because it is generated in situ. $2$.

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Dihydrogen

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(C) The reducing power of hydrogen species depends on their reactivity. $1$. Nascent hydrogen is highly reactive because it is generated in situ. $2$. Atomic hydrogen is also highly reactive due to the presence of an unpaired electron. $3$. Dihydrogen $(H_2)$ is a stable molecule with a strong $H-H$ bond $(436 \ kJ \ mol^{-1})$,making it the least reactive and thus the poorest reducing agent among the given options.

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