06. Reactions of alkenes 1

What are the 4 reactions?

Dehydrogenation of halogenoalkanes, catalytic hydrogenation of alkenes, acid catalysed hydration of ethene, addition polymerisation of ethene

What are the reagents and conditions for dehydrogenation of halogenoalkanes?

KOH in ethanol, reflux

What is the mechanism / type of reaction for dehydrogenation of halogenoalkanes?

Elimination

Show the general equation of dehydrogenation of halogenoalkanes

CH₃CH₂Br -> C₂H₄ + HBr

Draw the reaction of dehydrogenation of halogenoalkanes

Yes

What are the reagents and conditions for catalytic hydrogenation of alkenes?

Nickel catalyst, 70atm, 60 degrees

What is the mechanism / type of reaction for catalytic hydrogenation of alkenes?

Electrophilic addition

Show the general equation of catalytic hydrogenation of alkenes

C₂H₄ + H₂ -> C₂H₆

Draw the catalytic hydrogenation (reduction) of alkenes mechanism

Yes

What is the catalyst in catalytic hydrogenation of alkenes?

Raney Nickel -> very finely divided Ni

How is raney nickel prepared?

Dissolving an alloy of Al and Ni in NaOH, leaving a suspension of Ni