Question

preparation of ethane and ethene from bromoethane

Answer 1

I think these are the methods 

CH3Br+CH2CuLi→CH3-CH3+CH3-Cu+LiBr

we can prepare ethene by saytzeff's rule

CH3-CH2Br+C2H5OH /C2H5OK → CH2=CH2

Answer 2

Hello dear,

● Bromoethane to ethene -
Bromoethane on treatment with alcoholic potassium hydroxide gives ethene.
CH3-CH2-Br + alc.KOH --> CH2=CH2 + KBr + H2O

● Bromoethane to ethane -
For this, we'll first convert bromoethane to ethene.
CH3-CH2-Br + alc.KOH --> CH2=CH2 + KBr + H2O

Ethene is then reduced to ethane with Ni/H2.
CH2=CH2 + H2 --> CH3-CH3


Hope this helps you...