Induction of anesthesia usually requires the following:
Hypnosis (or unconsciousness): This is usually accomplished with an IV Anesthetic such as propofol, etomidate, ketamine or benzodiazepines.
Anterograde Amnesia: This is usually accomplished with a benzodiazepine (e.g midazolam).
Analgesia: Usually accomplished through hypnosis and/or regional blocks and/or Analgesics.
Paralysis: Usually accomplished with a neuromuscular blocker or through deep sedation.
Importantly, the volatile anesthetics (sevoflurane, desflurane or isoflurane) will provide 3 of the 4 components of general anesthesia (are not analgesics).
Additionally, small doses of midazolam (for anxiolysis/sedation) and fentanyl (to blunt stimulation caused by laryngoscopy) are also often given during or right before induction.
All these agents are given during pre-oxygenation (as once induction is complete patients will become apneic).