The IUPAC name of the compound `CH_3` - `CH_3` `C_4H` - `C_3H` = `CH_1` - `CH_2OH` is
4-methyl pent 2-en-1-ol
2-Methyl-4-pentenol
4-methyl-2-pentenol
2-methyl-4-en-1-ol
could you explain more clearly with expanded structure?