The names of some compounds are given. Which one not in the `IUPAC` system?

Options

A. `{:(" "CH_3),(" "|),(CH_3CH_2-CH_2-CH-CH-CH_2CH_3),(" "|),(" "CH_2CH_3),(" 3- methyl-4-ethlheptane"):}`
B. `{:(CH_3-CH-CH-CH_3),(" | |"),(" OH " CH_3),(" 3-methyl - 2 - butanol"):}`
C. `{:(CH_3-CH_2-C-CH-CH_3),(" || |"),(" " CH_2CH_3),(" 2-ethyl - 3 -methylbut -1-ene"):}`
D. `{:(CH_3-C-=C-CH(CH_3)_2),(" 4- methyl-2-pentyne"):}`

Answer

A