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MCQEasyJEE 2024Nomenclature (IUPAC & Common)

JEE Chemistry 2024 Question with Solution

The IUPAC name of the compound CH3CH2CH(OH)CH3 is:

  • A

    1-Butanol1\text{-Butanol}

  • B

    2-Butanol2\text{-Butanol}

  • C

    tert-Butanol\text{tert-Butanol}

  • D

    Isobutanol\text{Isobutanol}

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: The compound is CH3CH2CH(OH)CH3.

Find: Its correct IUPAC name among the given options.

The solution appears to discuss a different question involving a cyclohexane derivative, but it explicitly states that the correct option is B. Using that conclusion together with the given compound, the parent chain contains 44 carbon atoms, so the base name is butane. The hydroxyl functional group gets priority in numbering, and numbering from the nearer end places OH at carbon 22.

Therefore, the IUPAC name is 2-Butanol2\text{-Butanol}.

The correct option is B.

Common mistakes

  • Choosing 1-Butanol1\text{-Butanol} by numbering the chain from the wrong end. The OH group must get the lowest possible locant. Number from the nearer end so the alcohol is at carbon 22, not carbon 11.

  • Confusing CH3CH2CH(OH)CH3 with tert-Butanol. tert-Butanol has a different carbon skeleton with the OH group on a tertiary carbon. First identify the actual continuous chain before naming.

  • Selecting Isobutanol from a common-name pattern match. Common names depend on branching, and this structure is not isobutyl alcohol. Use IUPAC rules based on the longest chain and the principal functional group position instead.

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