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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 of $\mathrm{CH}_3-\mathrm{C}\left(\mathrm{CH}_3\right)(\mathrm{OH}) \mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2$​ is:
  • ✓
    $2,4-$Dimethylpentan$-2-ol$
  • B
    $2,4-$dimethylpentan$-4-ol$
  • C
    $2,2-$dimethylbutane
  • D
    $2,4,4-$trimethylbutan$-2-ol$
✓

Answer

Correct option: A.
$2,4-$Dimethylpentan$-2-ol$
In the longest carbon chain,$ −OH$ group is closest to the left$-$hand side, therefore we number from the left-hand side.
There is $5$ carbon in the longest chain, in second and fourth positions methyl group is attached and in second position there is an alcoholic group. Thus $\text{IUPAC}$ name is $2,4-$Dimethyl pentan$-2-ol.$

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