alkene alkyne reactivity

which one is more reactive: alkene or alkyne?
what is da case for (1)GENERAL rxns and for (2)Hydrogenation specifically??
pl giv reason also
thnx

2 Answers

Towards Electrophilic addition reaction ---
R-CCH + E⁺ ---> R-C⁺=CH-E (vinylic carbocation)

R-CHCH2 + E⁺ --->R-C⁺-CH₂-E (alkyl C⁺ )

Apparently alkynes may seem more reactive but alkene is more reactive as alkyl carbocation is more stable than vinyl carbocation.

Hydrogenation occurs simply via chemizorption,,more the Î e^- density,,more the chemizorption,,therefore alkynes are more reactive in this case.

thnks

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