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

  1. A
    3-methyl-2 butanol
  2. B
    CH3 – C ≡ C - CH(CH3)2
  3. C
    4-methyl-2-pentyne
  4. D
    3-methyl-4 ethyl heptane

Solution & Step-by-step Explanation

To answer this question, we need to examine each option and determine if it follows the IUPAC rules for nomenclature. Option (A) 3-methyl-2 butanol seems to follow the rules, as it specifies the position of the methyl group and the alcohol functional group. Option (B) is a structural formula and does not provide a name to evaluate. Option (C) 4-methyl-2-pentyne also seems correct, as it specifies the position of the methyl group and the alkyne functional group. Option (D) 3-methyl-4 ethyl heptane is incorrect because, according to IUPAC rules, when there are multiple alkyl groups, they should be listed in alphabetical order, and the correct name should be 4-ethyl-3-methylheptane. Therefore, the correct answer is option (D) 3-methyl-4 ethyl heptane. Think of it this way: IUPAC nomenclature has specific rules for naming compounds, including the order in which substituents are named and the use of prefixes and suffixes to indicate functional groups.

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Names of some compounds are given. Which one is not correct in IUPAC system ?
A
3-methyl-2 butanol
B
CH3 – C ≡ C - CH(CH3)2
C
4-methyl-2-pentyne
D
3-methyl-4 ethyl heptane

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IUPAC Nomenclature

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