Question
Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction :
CH4 + I2 $$\mathrel{\mathop{\kern0pt\rightleftharpoons} \limits_{{\mathop{\rm Re}\nolimits} versible}^{hv}} $ CH3 $-$$ I + HI
CH4 + I2 $$\mathrel{\mathop{\kern0pt\rightleftharpoons} \limits_{{\mathop{\rm Re}\nolimits} versible}^{hv}} $ CH3 $-$$ I + HI