From the following, which are Glycols?
A. Alcohols without any hydroxyl group.
B. Ketones containing two hydroxyl groups.
C. Alcohols containing two hydroxyl groups.
D. Aldehydes containing two hydroxyl groups.
Glycols are polyalcohols, usually containing two hydroxyl groups. These are saturated compounds, the simplest being ethylene glycol, CO2OHCH2OH. The suffix -ol should remind you that we are dealing with alcohols.
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While these questions do not fit the MCAT format (they have no related reading passages) they cover concepts one should understand in order to do well in the biological sciences portion of the MCAT.

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