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Name the product A,B and C formed in the...

Name the product A,B and C formed in the following reactions. Give the equations for the reactions.
`Ethylene overset(Br_(2)//C Cl_(4))to A overset(Alc.KOH)to B overset(Br_(2))to C`

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A is 1,2-dibromoethene.
B is acethylene.
C=1,1,2,2-tetra bromoethene.
`CH_(2)=CH_(2) overset(Br_(2)//C Cl_(4))to overset(Br)overset(|)(CH_(2))-overset(Br)overset(|)(CH_(2)) -overset(Br)overset(|)(CH_(2))-overset(Br)overset(|)(CH_(2)) underset(-2HBr)overset(Alc KOH)to HC-=CH`
`HC-=CH overset(Br_(2))to H-underset(Br)underset(|)overset(Br)overset(|)(C)-=overset(Br_(2))to H-underset(Br)underset(|)overset(Br)overset(|)-H`
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