Which of the following compounds are not oxidized by `HIO_(4)` ?
(1) `underset(" "CH_(2)-OH)overset(CH_(3)-CH-OH)(|)" "`(2) `underset(" "H-C=O)overset(CH_(3)-C=0)(" "|)`
(3) `underset(CH_(3)-C=O)overset(CH_(3)-C=O)(" "|)" "`(4) `underset(" "CH_(3)-CH-NH_(2))overset(CH_(3)-C=O)(" "|)`
(5)

`" "(6)underset(" "CH_(2)-OH)overset(" "CH_(2)-OCH_(3))("|")" "` (7) `underset(" "CH_(2)-OH)underset(|)overset(O)overset(||)(" "C-OH)`