C2H2+H2O соли Hg2+=> CH3-CH=O
CH3CHO+2Cu(OH)2=>Cu2O+2H2O+CH3COOH
CH3COOH+CH3-CH2-CH2-OH=>CH3COOC3H7+H2O
CH3COOC3H7+H2O=>CH3COOH+CH3-CH2-CH2-OH
2.
C2H6 t Ni =>C2H4+H2
C2H4+H2O=>C2H5OH
C2H5OH+HCOOH=>HCOOC2H5+H2O
HCOOC2H5+H2O=>HCOOH+C2H5OH
3.
CaC2+2H2O=>Ca(OH)2+C2H2
C2H2+H2O=>CH3-CH=O
C2H4O+H2 Ni=>CH3-CH2-OH
2CH3CH2OH+6O2=>4CO2+6H2O
4.
C2H6 t Ni =>C2H4+H2
C2H4 t Ni =>C2H2+H2
C2H2+H2O Hg2+ =>CH3-CH=O
CH3CHO+2Cu(OH)2=>Cu2O+2H2O+CH3COOH
CH3COOH+CL2=>CH2(CL)COOH+HCL
n(H2)=5,6/22,4=0,25моль
n(Ме)=n(Н2)=0,25моль
М(Ме)=16,25\0,25=65
М(Zn)=65
ответ:цинк