"What would happen if i input 9 volts to an arduino anolog read port?"
That depEnds on many factors, like how your arduino is powered.
Generally, you will likely see the clamping diodes getting damaged (by itself not a big deal). But what comes after that is hard to predict.
A pin remains fully functiobal (aka their input/out + periheral functions) even if the clamp diodes are blown.