The best replacement for alkenes is alkanes.

The best alternatives to alkenes are rated as following:
★★★★★  alkanes
★★★  alkynes
★★★  alkanes more reactive
★  alkanes boiling point
  alkanes boiling points

Your alternative for alkenes is not listed? Suggest!
Speaking about alkenes, one probably shouldn't forget about kmno4.

Other search terms related to alkenes and their ratings are:
★★★★★ kmno4
★★★★ hbr
★★★ ozone
★★ potassium permanganate
★ peracids
★ bromine water
★ hot kmno4
★ hydrogen halides
You have in mind a companion for alkenes and it is not yet here? Propose!



Google Trends

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alkenes
alkanes
alkynes