Best uterine relaxation is seen with:
Halothane inhibit intestinal and uterine contractions. This propey is used for facilitating external or internal version during late pregnancy. However it&;s use during labour can prolong delivery bad increase postpaal blood loss. Muscle relaxation is minimal with nitrous oxide. Rest of the drugs donot have uterine contractions as a propey. From KD Tripati 7th edition Page no 378,379
Chloroform
Nitrous oxide
Ether
Halothane
Anesthesia