Question

Names of some compounds are given. Which one is not in IUPAC system ?
A. `{:(" "CH_(3)),(" |"),(CH_(3)-CH_(2)-CH_(2)-CH-CH-CH_(2)CH_(3)),(" |"),(" "CH_(2)CH_(3)),(" 3-Methyl-4-ethylheptane"):}`
B. `{:(CH_(3)-CH-CH-CH_(3)),(" |"" |"),(" "OH" "CH_(3)),("3-Methyl-2-butanol"):}`
C. `{:(CH_(3)-CH_(2)-CH-CH-CH_(3)),(" ||"" |"),(" "CH_(2)" "CH_(3)),(" 2-Ethyl-3-methylbut-1-ene"):}`
D. `underset("4-Methyl-2-pentyne")(CH_(3)-C-=C-CH(CH_(3))_(2))`

Answer 1

Correct Answer - A
The means of the alkyl subtituents are not in alphabetical order. The correct name is 4-ethyl 3-methylheptane.