As per the law of equi-partition of energy each vibrational mode gives how many degrees of freedom ?

Law of equipartition of energy states that the energy for each degree of freedom in thermal equilibrium is $\frac{1}{2}{k}_{B}T$.

Thus each vibrational mode gives 2 degrees of freedom (kinetic and potential energy modes) corresponding to the energy $2\times \frac{1}{2}{k}_{B}T = k_{B}T$