Which of the Following Statements is True

Question

Which of the following statements is true?
A) All diols are glycols.
B) All glycols contain both a primary and a secondary alcohol.
C) All glycols are diols.
D) All glycols must have at least three carbon atoms.

Accepted Answer

A diol is a molecule that contains two hydroxyl (-OH) groups. A glycol is a diol that has two hydroxyl groups attached to adjacent carbon atoms. Therefore, all glycols are diols, but not all diols are glycols. Option A is incorrect because not all diols have adjacent carbon atoms. Option B is incorrect because not all glycols have both primary and secondary alcohol groups. Option D is incorrect because glycols can have two carbon atoms, for example, ethylene glycol.