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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
The $\text{IUPAC}$ name for $\mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_2 \mathrm{C}\left(\mathrm{CH}_3\right)_2 \mathrm{OH}$ is:
  • A
    $1, 1-$dimethyl$-1, 3-$butanediol
  • ✓
    $2-$methyl$-2, 4$ pentanediol
  • C
    $4-$methyl$-2 4-$pentanediol
  • D
    $1, 3, 3-$ trimethyl $1-1, 3-$propanediol
✓

Answer

Correct option: B.
$2-$methyl$-2, 4$ pentanediol
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 $\text{IUPAC}$ name is$:\ 2-$Methyl$-2,4$ pentanediol.

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