The ionization enthalpy of hydrogen atom is $1.312 \times 10^{6} \; J/mol$. The energy required to excite the electron in the atom from $n=1 \rightarrow n = 2$ is:

Question

$$\begin{matrix} (A)\; 8.51 \times 10^5 \; J/mol \\ (B)\; 6.56 \times 10^5 \; J/mol \\ (C)\; 7.56 \times 10^5 \; J/mol \\ (D)\; 9.84 \times 10^5 \; J/mol \end{matrix}$$