Name the reagents used in the following reactions:

(i) Dehydration of propan-2-ol to propene.
(ii) Butan-2-one to butan-2-ol.

(i) Concentrated H₂SO₄ or H₃PO₄

(ii) catalytic hydrogenation or sodium borohydride (NaBH₄) or lithium aluminium hydride (LiAlH₄)