The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are, respectively :

Question

$\begin{array}{1 1} (1)Li_2O, Na_2O\;and\;KO_2 \\ (2) LiO_2, Na_2O_2\; and\; K_2O \\ (3) Li_2O_2, Na_2O_2\; and\;KO_2 \\(4) Li_2O, Na_2O_2\; and\; KO_2 \end{array} $