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
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2 Answers
11Towards Electrophilic addition reaction ---
R-C
CH + E+ ---> R-C+=CH-E (vinylic carbocation)
R-CH
CH2 + 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.