Which among the following reactions is a...

Which among the following reactions is an example of auto catalysis?
(i) `CH_3 COOC_2H_5 + H_2O to CH_3COOH + C_2H_5OH`
(ii) `2H_2O_2 to 2H_2O +O_2`
(iii) `2SO_2 + O_2 to 2SO_3 `
(iv) ` 2AsH_3 to 2As + 3H_2`

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