Which of the following should be added in the compound for the detection of carbon and hydrogen?

Carbon and hydrogen are detected by heating the compound with Cu(II) oxide. Carbon present in the compound is oxidised to carbon dioxide (tested with lime-water, which develop turbidity) and hydrogen to water (tested with anhydrous copper sulphate, which turns blue).C+2CuO⟶Δ2Cu+CO2↑,2H+CuO⟶ΔCu+H2OCO2+Ca(OH)2⟶CaCO3↓ White turbidity +H2O