Which of the following reactions is associated with the most negative change in entropy?

Question

2 {SO}_{2} (g) + O_{2} (g) ⟶ 2 {SO}_{3} (g)

$C_{2} H_{4} (g) + H_{2} (g) ⟶ C_{2} H_{6} (g)$

C (s, graphite) + O_{2} ⟶ {CO}_{2} (g)

3 C_{2} H_{2} (g) ⟶ C_{6} H_{6} (l)

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