Question

common name for 1-methyl but -1,4-diol

Answer 1

The common name for 1-methyl but-1,4-diol is **1-methyl-2,3-butanediol**. However, note that naming conventions can vary, and this compound may also be referred to as **1-methyl-1,4-butanediol** in some contexts. Be sure to check the context in which the name is being used, as common names may differ in various chemical literature.