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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
The IUPAC name for CH3​CH(OH)CH2​C(CH3​)2​OH is:
  • A
    1, 1-dimethyl-1, 3-butanediol
  • B
    2-methyl-2, 4 pentanediol
  • C
    4-methyl-2 4-pentanediol
  • D
    1, 3, 3- trimethyl 1-1, 3-propanediol
✓

Answer

  1. 2-methyl-2, 4 pentanediol

Explanation:

The compound has 2 alcohol groups at C-2 positions on both the sides. From this point we can not say from where to start numbering.

But if we number from right hand side there is also a methyl group at C-2 position. So we start number from right hand side.

Since there are two alcoholic group, we use suffix "diol".

Thus IUPAC name is: 2-Methyl-2,4 pentanediol.

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