From which one of the following can both ethylene and acetylene be prepared in a single step reaction?

Options

A. `CH_3CH_2OH`
B. `BrCH_2CH_2Br`
C. `CH_3CH_2Br`
D. `BrCH_2CH_2OH`

Answer

B

Explanation

Ethylene is obtained through dehalogenation while acetylene is obtained thorough a double dehydrohalogenation.
`CH-=CHunderset((2)" "H_(2)//H^(+))overset((1)" "NaNH_(2)//("excess"))larrBrCH_(2)CH_(2)Brunderset(CH_(3)OH,Delta)overset(Zn)toCH_(2)=CH_(2)`