ya manja look in this qn. the compound exhibits hyperconjugation effect so tautomerism is possible and by shifting the double bonds due to this hyperconjugation effect u can create a number of different tautomers it is not just one keto tautomer that u can create cozu have two double bonds so for each applying hyperconjugation u can have a number of structures .

the most stable one however shud be -

 

SEE THIS IS THE MOST STABLE FORM OF GERAGINOL  B COZ U SEE ITS A CONJUGATED SYSTEM SO THERE IS +M EFFECT HENCE THE H ATTACHED TO O IS MOST ACIDIC IN THIS CASE SO THIS FORM IS MOST STABLE ENOL FORM DRAW THE KETO FORM OF THIS  

            C                        CH3

             ||                          |                   ..

H3C---C---C==C---C==C---C==C---O-H                    MOST STABLE ENOL FORM

            C                         CH3

 PLEASE CORRECT ME IF I HAVE MADE ANY MISTAKE