Question

Na → Na₂ O₂ → Na₂O→NaOH​

Answer 1

$\boxed {\bf Na \to Na_2O_2 \to Na_2O \to NaOH}$
$\sf 1)~2Na + O_2 \to Na_2O_2.$
$\sf 2)~ Na_2O_2 + 2Na \to 2Na_2O.$
$\sf 3)~Na_2O + H_2O \to 2NaOH.$