Here it is
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The answer is C. How more far the OH groups,  the boilingpoint and meltingpoint will increase.

Quote from: chenbeier on January 07, 2022, 06:00:56 AM
The answer is C. How more far the OH groups,  the boiling point and melting point will increase.

This is wrong answer.
Symmetrical diol has zero dipole moment so its going to be least.

Then ortho diol has most OH groups creating more dipole so more polar and strong IMF.
Based on this select the answer.