Question

Convert propene to propyne.(in steps)​

Answer 1

Step 1 : First propene react with bromine in dark in a solvent such as to produce 1,2-dibromopropane as a product. It is an electrophilic addition reaction.

Step 2 : When 1,2-dibromopropane react with strong base like alcoholic KOH result in the formation of prop-1-yne. The alcoholic KOH is a dehydrohalogenating agents.

Answer 2

Answer:

Propene to propyne

CH3−CH=CH2+Br2−→−−CCl4CH3−CH(Br)−CH2(Br)−→−−−−Liq.NH3NaNH2CH3−C≡CH

Propene is converted to propyne by reacting carbon tetrachloride to form 1, 2-dibromopropane which reacts with sodium amide and liquid ammonia to form propyne

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