Question

The IUPAC name for $C{H}_{3}CH\left(OH\right)C{H}_{2}C(C{H}_3{)}_{2}OH$ 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

Answer: (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 IUPAC name is: 2-Methyl-2,4 pentanediol