$1)$$*)$Ở nhiệt độ bình thường :
$RCHO+Cu(OH)_2\rightarrow $không phản ứng !
$2HCOOH+Cu(OH)_2\rightarrow Cu(OOCH)_2+2H_2O$
$RCHO+CuO\rightarrow $không phản ứng !
$2HCOOH+CuO\rightarrow Cu(OOCH)_2+H_2O$
$*)$Đun nóng nhẹ nhàng :
$RCHO+2Cu(OH)_2\rightarrow RCOOH+Cu_2O\downarrow+2H_2O$
$HCOOH+2Cu(OH)_2\rightarrow CO_2\uparrow+Cu_2O\downarrow+3H_2O$
$RCHO+2CuO\rightarrow RCOOH+Cu_2O$
$HCOOH+2CuO\rightarrow CO_2+Cu_2O+H_2O$
$2)$
$CH_2=CH-CH_2Cl+H_2O\rightarrow CH_2=CH-CH_2OH+HCl$
$CH_2=CH-CH_2Cl+H_2O\rightarrow CH_3-CH(OH)-CH_2Cl$
$CH_2=CH-CH_2Cl+2H_2O\rightarrow CH_2-CH(OH)-CH_2OH+HCl$
$C_2H_5MgCl+H_2O\rightarrow C_2H_6+MgCl(OH)$