Which compounds are isomers?
A. Ethane and ethanol.
B. Methanol and methanal.
C. 1-propanol and 2-propanol.
D. Methanoic acid and ethanoic acid.
By definition isomers have the same molecular formula but different structural formulas. Choice 3 compounds have the same molecular formula but the -OH group is located on the first or second carbon atoms. The other choices do not have the same molecular formulas.
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Added: 6/29/2008
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Founded by JPlantesMD
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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