<prompt> Local anaesthetic with prolonged action -ProcaineCocaineLidocaineDibucaine  <response>: Ans. is d i.e., Dibucaineo Dibucaine is the longest acting local anaesthetico Chlorprocaine is the shortest acting local anaesthetico Decreasing order of duration : - Dibucaine Bupivacine Tetracaine Ropivacaine Etidocaine Prilocaine Lignocaine Mepivacaine Cocaine Procaine Chlorprocaine. 