The order of reactivity of different hydrogens are

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Nascent hydrogen > Atomic hydrogen > Ordinary hydrogen

Ordinary hydrogen > Nascent hydrogen > Atomic hydrogen

Atomic hydrogen > Ordinary hydrogen > Nascent hydrogen

Atomic hydrogen > Nascent hydrogen > ordinary hydrogen.

answer is A.

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Detailed Solution

t_1/2 of Atomic hydrogen is only 0.3 sec. so most reactive. Nascent Hydrogen is formed during reaction more reactive than ordinary hydrogen. One of the evidence is atomic torch which is used to generate heat, used for welding purpose.

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