Question

Acetylene undergoes addition reactions in two stages.

Answer 1

Answer. In addition reaction first triple bond is changed to double bond and again double bond changes to single bond. That is the reason acetylene undergoes addition reactions in two stages. For example, hydrogenation of acetylene

                           Ni

      HC≡CH    +   H2   250-300 C     H2C=CH2

                    Ni

      H2C=CH2    +   H2   250-300 C     H3C-CH3

Comments

easy answer to understand thanks

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