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a hydrocarbon C4H8 , neither decolorised bromine in CCl4solution nor reacted with HBr. when heated to 200 degree celcius with H2 in the presence of Ni catalyst, a new hydrocarbon C4H10 was formed.what was the structure of original hydrocarbon?(1)n-butene (2) cis-but-2-ene (3)isobutene (4) Cyclobu†an(2)

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