Where are you going to?? <-- Is it right sentence?

you can say that. It is not strictly correct, because of the (what I consider stupid) rule against ending a sentence in a preposition. You are supposed to say, instead, "to where are you going", or "where are you going".

One could argue that including "to" at the end is of no value, because "going" implies "to somewhere". You don't need to say "to".

So, depending on who is reading the sentence, the sentence could be considered just fine (people say exactly what you wrote, all the time, after all) or considered in error.

Choices:

1) Where are you going to go ?

2) Where are you going ?

'Where are you going?' is the best because 'Where are you going to?' is not used in the English language commonly.

Wher are you going... is better !!