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NEET Chemistry · Some Basic Principles of Organic Chemistry

IUPAC nomenclature

Taught in NCERT Class 11 Chemistry, Chapter 8: Organic Chemistry: Some Basic Principles and Techniques.

1 verified question: Easy 0 · Medium 1 · NEET level 0

Sample questions

Sample 1Medium

What is the IUPAC name of CH3–CH(CH3)–CH2–CH(OH)–CH3?

  1. A

    2-methylpentan-4-ol

  2. B

    1,3-dimethylbutan-1-ol

  3. C

    4-methylpentan-2-ol

  4. D

    4-methylpentan-1-ol

Show the answer
The answer is C.

The longest chain containing the carbon bearing OH has five carbons. Numbering from the end nearer the OH group puts OH on C-2 and the methyl on C-4, giving 4-methylpentan-2-ol.

  • A.

    The chain is numbered from the wrong end; the OH group must get the lowest locant.

  • B.

    This does not use the longest chain; a methyl at C-1 extends the chain to five carbons.

  • D.

    This places OH on a terminal carbon, which is a different compound.

NCERT: Class 11 Chemistry, Chapter 8, 8.5

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