Final answer:
The correct sequence of molecular weight for local anesthetics is bupivacaine > lignocaine > cinchocaine > prilocaine. Anesthetic potency generally increases with increasing molecular weight.
Step-by-step explanation:
The correct sequence of molecular weight for local anesthetics is:
B. Bupivacaine > lignocaine > cinchocaine > prilocaine
The molecular weight of a local anesthetic can affect its potency and toxicity. Anesthetic potency generally increases with increasing molecular weight. Therefore, bupivacaine, with the highest molecular weight among the options, is expected to have the greatest potency.