The correct chemical reactions for the transformation of CuO to Cu are as follows:

CuO + H2SO4 -> CuSO4 + H2OCuSO4 + 2NaOH -> Cu$OH$2 + Na2SO4Cu$OH$2 -> CuO + H2O

Therefore, the correct sequence of reactions for the transformation of CuO to Cu is:

CuO -> CuSO4 -> Cu$OH$2 -> Cu