The bitter compound denatonium is often added to this substance. For 10 points each:
[10h] Name this lab solvent which contains aversants or toxic compounds to prevent pesky undergraduates from consuming it.
ANSWER: denatured alcohol [prompt on ethanol or alcohol]
[10m] Denatonium is one of these compounds which contain a positively charged nitrogen with four substituents.
ANSWER: quaternary ammonium cations [or quaternary ammonium salts; accept quats]
[10e] Denatured alcohol may instead contain this toxic wood alcohol. Consumption of this compound causes blindness due to its conversion to formic acid and subsequent damage to the optic nerve.
ANSWER: methanol
<AW, Chemistry>