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Which series of reactions correctly represents chemical relations related to iron and its compound ?

1. Fe    →  heat , O 2 FeO    →  4 2 SO H dil FeSO 4  →  heat Fe
2. Fe    →  heat , Cl 2 FeCl 3   →  ari , heat FeCl 2 →  Zn Fe
3. Fe    →  heat , O 2 Fe 3 O 4    →  C º 600 , CO FeO    →  C º 700 , CO Fe
4. Fe    →  4 2 SO H dil FeSO 4    →  2 4 2 O , SO H Fe 2 (SO 4 ) 3  →  heat Fe

Correct answer: Fe    →  heat , O 2 Fe 3 O 4    →  C º 600 , CO FeO    →  C º 700 , CO Fe

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