I.CH2=CHCH=CH2(g)+2H2(g)⇌CH3CH2CH2CH3(g) ∆H1
Il.CH3C≡CCH3(g)+2H2(g)⇌CH3CH2CH2CH3(g) ∆H2
III.CH3C≡CCH3(g)⇌CH2=CHCH=CH2(g) ∆H3
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