Fe2O3->FeCl3->Fe(OH)3->FeC l3
До іть

Fe2O3+6HCl-->2FeCl3+3H2O

FeCl3+3H2O-->Fe(OH)3+3HCl

Fe(OH)3+3HCl-->FeCl3+3H2O

c2h4+cl2=(hv)hcl+c2h3cl

2c2h3cl+2na= 2nacl + c4h10 

c4h10=(pt) ch3-ch2-ch=ch2+h2

ch3-ch2-ch=ch2 + hbr= ch3-ch2-ch2br-ch3

  ch3-ch2-ch2br-ch3 +naoh =(c2h5oh ) ch3-ch=ch-ch3 +nabr +h2o 

ch3-ch=ch-ch3 +br2=ch3-ch2br-ch2br-ch3 

ch3-ch2br-ch2br-ch3 +2koh= ch3-ch=c=ch3 +2 kbr +2h2o

ответ номер 2