Methylated spirit is

Consider the following statements about oxidation. It is the process which involves:

$1$. Removal of oxygen.

$2$. Addition of hydrogen.

$3$. Removal of an electropositive element.

$4$. Addition of an electronegative element.

Which of the statements given above is/are true?

What is the oxidising agent in the following equation?

${\mathrm{HAsO}}_2\left(\mathrm{aq}\right)+{\mathrm{Sn}}^{2+}\left(\mathrm{aq}\right)+{\mathrm{H}}^{+}\left(\mathrm{aq}\right)⟶\mathrm{As}\left(\mathrm{s}\right)+{\mathrm{Sn}}^{4+}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$