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

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From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?
A. `CH_3CH_2OH`
B. `Br-CH_2-CH_2-Br`
C. `CH_3CH_2Br`
D. `Br-CH_2-CH_2-OH`
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Correct Answer - B
`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`
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