how is propyne converted to propane
Answers
I which propyne is reacted with highly conc.
hydrogen.
Answer:
Propyne is converted to propane through hydrogenation catalytic reduction reaction under the catalyst like palladium supported on carbon (Pd/C) taking place with solvents like methyl or ethyl alcohol.
Solution:
This follows the general principle of Markovnikov’s rule that states when a protic acid (HX) like HBr or HCl is added to an alkene or alkyne, the H atom of the HX gets attached to the C atom of the alkene or alkyne.
The addition reaction takes place at the triple bond which converts to alkenes and then to alkanes. (Refer image 1)
Propyne when made to react with HBr through electrophilic addition mechanism in the presence of peroxide to form propene. Addition of the HBr to the propene leads to electrophilic substitution reaction which forms 2-bromopropane but the benzoyl peroxide presence during the reaction forms 1-bromopropane. (Refer image 2)
