Calculate the bond energy of $Cl-Cl$ bond from the following data: $CH_4(g) + Cl_2(g) \rightarrow CH_3Cl(g) + HCl(g); \Delta H = -100.3\: kJ$. Also the bond energies of $C-H,\: C-Cl,\: H-Cl$ bonds are 413, 326 and 431 kJ/mol respectively.

Question

$\begin {array} {1 1} (A)\;-243.7\: kJ/mol & \quad (B)\;243.7\: kJ/mol \\ (C)\;444.3\: kJ/mol & \quad (D)\;-444.3\: kJ/mol \end {array}$