Can someone tell me.how to know the more higher rate of inductive effect? Im confused

Answer 1

I'm not sure what you mean by "higher rate" of inductive effect.
F > Cl > Br > I
Also it depends upon how far apart the F,Cl, Br atoms are from the group affected.
Here is a site where you can read more.
https://en.wikipedia.org/wiki/Inductive_effect

Answer 2

I mean how can i know if its more polar when compare to other moleculees

Answer 3

You look at the electronegativity. More EN makes more polar.