Điều chế etan a) từ ethylbromid ch3-ch2-br B)etanol ch3ch2oh C)cac2

Đáp án:

a, 

$CH_3-CH_2Br+NaOH\xrightarrow{{C_2H_5OH, t^o}} C_2H_4+NaBr+H_2O$ 

$C_2H_4+H_2\xrightarrow{{Ni, t^o}} C_2H_6$

b,

$CH_3-CH_2OH\xrightarrow{{H_2SO_4 đ, 170^oC}} C_2H_4+H_2O$ 

$C_2H_4+H_2\xrightarrow{{Ni, t^o}} C_2H_6$

c, 

$CaC_2+2H_2O\to Ca(OH)_2+C_2H_2$

$C_2H_2+2H_2\xrightarrow{{Ni, t^o}} C_2H_6$