Dislocation/grain boundary interactions play an important role in mechanical properties of materials such as strength, ductility and fracture toughness. We implemented molecular statics approach to study the interactions between < a > screw, < c > edge on (10-10) prism plane and < c+a > mixed dislocation on pyramidal-I plane with two different Symmetrical tilt grain boundaries (STGBs)- namely (-1011) and (-1013) in Ti. Depending on the slip system, atomic structure of STGB and stress/strain states, different dislocation reactions were identified. In some cases, we observed (10-12) twin nucleation due to slip transfer at the boundary. Other than twin nucleation, slip transmission through the boundary, dissociation of the incoming dislocation into the Shockley partials and twin dislocation formation on the were boundary observed. These results shed light on the underlying mechanisms governing the deformation of Ti.