[pesona3f]

if a structure consist of multiple functional group, is there any priority to choose which is more tend to react?

let say 2 -propenol which consist carbon double bond and hydroxyl group react with HCL in acidic condition.... which one will react??

[aldoxime_amine]

It depends on which functional groups we are talking about and also to some extent on the solvent.
In case of propen-2-ol wich is enol of acetone, addition of HCl won't cause anything.
But in case of proen-3-ol, it depends on the HCl; dry gaseous, dilute, concentrated,etc

[pesona3f]

is there any general way to determine the major product .. take example propen-3-ol react with HCl in H2SO4

[aldoxime_amine]

Well, dilute conditions won't "affect" the double bond. So, first there will be carbocation formation at C-2, followed by carbocation rearrangement.