Which volatile anesthetic is not an ether derivative?

Which volatile anesthetic is not an ether derivative?

• A. Halothane
• B. Enflurane
• C. Isoflurane
• D. Desflurane

Answer: (A)

The key idea is the chemical structure of the volatile anesthetic. Most modern halogenated volatile anesthetics are ethers, meaning they contain an oxygen atom linking carbon groups (an ether bond). Enflurane, isoflurane, and desflurane all have this ether linkage, so they are ether derivatives. Halothane, however, is a halogenated alkane that lacks an ether bond, so it is not an ether derivative. That structural difference is why halothane is the correct choice.

The key idea is the chemical structure of the volatile anesthetic. Most modern halogenated volatile anesthetics are ethers, meaning they contain an oxygen atom linking carbon groups (an ether bond). Enflurane, isoflurane, and desflurane all have this ether linkage, so they are ether derivatives. Halothane, however, is a halogenated alkane that lacks an ether bond, so it is not an ether derivative. That structural difference is why halothane is the correct choice.