if we use Antimatter as method of propulsion is it possible to reach speed of light ?
Accelerating mass to the speed of light requires infinite energy. A matter-antimatter reaction releases a huge amount of energy, but $huge \neq \infty$, not even close.
On the other hand, if you want to accelerate something without mass to the speed of light, you don't need anything fancy such as antimatter. Just turn on a flashlight.