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A certain compound was found to have the molecular formula C5H12O2?

A certain compound was found to have the molecular formula C5H12O2. To which of the following compound classes could the compound belong? Check all the apply.
amide
ether
carboxylic acid
phenol
alcohol
ester

alcohol and ester
Those are the only ones you can make without messing up the H count.

alcohol is R-O-H i.e. C-O-H
ether is R-O-R i.e. C-O-C
where R is any carbon group