Sets

Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are incorrect and why?
(i) {3, 4} ⊂ A (ii) {3, 4} ∈ A (iii) {{3, 4}} ⊂ A
(iv) 1 ∈ A (v) 1 ⊂ A (vi) {1, 2, 5} ⊂ A
(vii) {1, 2, 5} ∈ A (viii) {1, 2, 3} ⊂ A (ix) φ ∈ A
(x) φ ⊂ A (xi) {φ} ⊂ A
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