A Common Way of Initiating Certain Chemical Reactions with Light $\Delta$

Multiple Choice

A common way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. If $\Delta$ H for the reaction Cl₂(g) $\rarr$ 2Cl(g) is 242.8 kJ/mol, what is the longest wavelength of light that will produce free chlorine atoms in solution?

A) 246.3 nm
B) 465.2 nm
C) 349.3 nm
D) 698.6 nm
E) 492.6 nm