Which of the following statement(s) is/are incorrect? (i) Dihydrogen reduces copper (II) oxide to...

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Which of the following statement(s) is/are incorrect?
(i) Dihydrogen reduces copper (II) oxide to copper
(ii) Reaction of dihydrogen with sodium gives sodium hydride.
(iii) Hydroformylation of olefins yields aldehydes which further undergo reduction to give alcohols.
(iv) Hydrogenation of vegetable oils using iron as catalyst gives edible fats.
(a) (i), (ii) and (iii)
(b) (i) and (iv)
(c) (iv) only
(d) (iii) and (iv)

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