Question

IUPAC name of pinacol is

• A. 2,3-dimethyl butane-1,4-diol
• B. 2,2-dimethyl butane-1,3-diol
• C. 2,3-dimethyl butane-2,3-diol
• D. 2,3-dimethyl butane-1,3-diol

Hint:

When naming compounds with multiple functional groups, make sure the position of each group is indicated correctly in the name according to IUPAC rules.

Answer 1

The Correct Option is C

Step 1: Understanding the structure of pinacol.
Pinacol is a vicinal diol (two hydroxyl groups on adjacent carbon atoms) with the structure 2,3-dimethylbutane-2,3-diol. The two hydroxyl groups are attached to carbon atoms 2 and 3.
Step 2: Analyzing the options.
(A) 2,3-dimethyl butane-1,4-diol: This name is incorrect as the hydroxyl groups are not positioned at carbon atoms 1 and 4.
(B) 2,2-dimethyl butane-1,3-diol: This is not correct, as the positions of the methyl groups and hydroxyl groups do not match the structure of pinacol.
(C) 2,3-dimethyl butane-2,3-diol: This is the correct IUPAC name, as it accurately describes the structure of pinacol, with two hydroxyl groups on adjacent carbons 2 and 3.
(D) 2,3-dimethyl butane-1,3-diol: This is incorrect because the hydroxyl groups are not on carbons 1 and 3.
Step 3: Conclusion.
The correct answer is (C) 2,3-dimethyl butane-2,3-diol, as it correctly represents the IUPAC name for pinacol.