Final answer:
Ropivacaine produces less motor block than bupivacaine, is prepared as the R enantiomer, is less lipid-soluble than lignocaine, and possesses a better safety profile compared to lignocaine with respect to cardiotoxicity.
Step-by-step explanation:
Ropivacaine is a commonly used local anesthetic and relative to bupivacaine, it has certain distinctive properties. When comparing ropivacaine to bupivacaine, it is important to note that ropivacaine tends to produce less motor block than bupivacaine, making it potentially safer in some clinical applications where preservation of motor function is important. Answer B is true; ropivacaine is indeed prepared as the R enantiomer, which confers its lower lipid solubility and reduced propensity for central nervous system and cardiovascular toxicity. As for answer C, ropivacaine is indeed less lipid-soluble than lignocaine (lidocaine), which affects its pharmacokinetic profile and potential side effects. Regarding answer D, ropivacaine does not have the same cardiotoxicity as lignocaine; it is generally considered to have less cardiotoxic potential. In terms of physico-chemical properties, answer E, ropivacaine and bupivacaine have similar structures, but the R enantiomer of ropivacaine contributes to its distinct profile in terms of potency and safety.