Which of the following is not an isomer of butanal?
Options:
A .  
2-Butanone
B .  
2-Methyl propanal
C .  
2-Butanol
D .  
None of these
Answer: Option C : C Aldehydes and ketones can be functional isomers. But alcohols are not isomeric with aldehydes. You can just write down the structures of each and count the number of carbons, hydrogens, and oxygens to be certain.
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