# Which has the more +I effect, -OCH_3 or - CH_3?

$- C {H}_{3}$
The methyl ($- C {H}_{3}$) group has the most I+ effect. Methyl groups are electron donating, and thus push electrons into the molecule.
The methoxy ($- O C {H}_{3}$) group has a I- effect. This is because oxygen has a high degree of electronegativity, and thus pulls electrons towards itself.