Which of the following reactions increases production of dihydrogen from synthesis gas?

1. CH4(g)+H2O(g)Ni1270KCO(g)+3H2(g)

2. C(s)+H2O(g)1270KCO(g)+H2(g)

3. CO(g)+H2O(g)Catalyst673KCO2(g)+H2(g)

4. C2H6+2H2ONi1270K2CO+5H2