Names of some compounds are given. Which one is not in IUPAC system ?

1.	Names of some compounds are given. Which one is not in IUPAC system ?
Answer» `{:(""CH_(3)),("\|"),(CH_(3)-CH_(2)-CH_(2)-CH-CH-CH_(2)CH_(3)),("\|"),(""CH_(2)CH_(3)),("3-Methyl-4-ethylheptane"):}` `{:(CH_(3)-CH-CH-CH_(3)),("\|""\|"),(""OH""CH_(3)),("3-Methyl-2-butanol"):}` `{:(CH_(3)-CH_(2)-CH-CH-CH_(3)),("\|\|""\|"),(""CH_(2)" "CH_(3)),(" 2-Ethyl-3-methylbut-1-ene"):}` `underset("4-Methyl-2-pentyne")(CH_(3)-C-=C-CH(CH_(3))_(2))` Solution :The means of the ALKYL subtituents are not in alphabetical order. The CORRECT NAME is 4-ethyl 3-methylheptane.

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