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

From which one of the following both ethylene and acetylene could be p

1.	From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?
Answer» `CH_3CH_2OH` `Br-CH_2-CH_2-Br` `CH_3CH_2Br` `Br-CH_2-CH_2-OH` SOLUTION :`BrCH_2-CH_2Br UNDERSET((-ZnBr_2))OVERSET(Zn//CH_3OH, DELTA)to CH_2=CH_2` `BrCH_2-CH_2Br overset(NaNH_2 "in LIQ."NH_3)to HC-=CH`