Concept:Isomers share the same molecular formula but have different structural arrangements.
Explanation:The formula
C3H8O can represent either alcohols or ethers.
The alcohol isomers are propan-1-ol,
CH3CH2CH2OH, and propan-2-ol,
CH3CH(OH)CH3.
The ether isomer is ethyl methyl ether (methoxyethane),
CH3CH2OCH3.
Therefore, two alcohols and one ether exist.
No other stable structural arrangements fit the formula
C3H8O.
Thus, the total number of structural isomers is three.
Answer:B. 3