<prompt> Anesthetic not painful on Intravenous administration isMethohexitalEtomidatePropofolKetamine  <response>: Ketamine:- Ketamine on intravenous administration is absolutely devoid of pain at injection site. Ketamine is a NMDA antagonist intravenous general anesthetic agent - that induces a characteristic cataleptic state called Dissociative Anesthesia - a state of induced dissociation from onself and surrounding. Dissociative anesthesia is due to selective interruption of association pathways in the neocoex and thalamus -- characteristic somato-sensory blockade, a combination of Catalepsy Catatonia Analgesia Amnesia without complete loss of consciousness like other general anesthetics Ref:- Goodman Gilman Pharmacological Basis of Therapeutics 13th Ed; Pg num:- 391 