In which one of the following equilibria, Kp $ \ne $ KC ?

Question

In which one of the following equilibria, K_p $ \ne $ K_C ?

2NO(g) ⇋ N₂(g) + O₂(g)

2C(s) + O₂(g) ⇋ 2CO(g)

2HI(g) ⇋ H₂(g) + I₂(g)

NO₂(g) + SO₂(g) ⇋ NO(g) + SO₃(g)

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