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What happean when HBr is added to ethyne...

What happean when HBr is added to ethyne?

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When HBr across triple bond to form gem dihalides.
`underset("Ethyne")(CH equiv CH ) + HBr rarr underset("Bromoethene(Vinyl bromide)")(CH_(2) = CH - Br ) underset(M - "Rule")overset(HBr)(rarr) underset(1,1 -" dibromo ethane ")(CH_(3)) - overset(Br)overset(|)(CH)- Br `
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