Verified answer

1)CH3-CH3=(t) CH2=CH2+H2

2)CH2=CH2+HOH=(H2SO4к) CH3-CH2-OH

3)CH3-CH2-OH+CuO=CH3COH+Cu+H2O

4)CH3COH+Cu(OH)2=CH3COOH+CuO+H2O

5)CH3COOH+CH3-CH2-OH=CH3COO-C2H5 + H2O