Which choice is a pair of isomers?
propanol and ethane
H2NCH2CH3 and CH3CH2NH2
CH3CH2CH2CH2CH3 and CH3CH2CH(CH3)2
CH3CH2OH and CH3OCH2CH3
1-butene and 2-methylpropane
H2NCH2CH3 and CH3CH2NH2 Same compound written backwards
CH3CH2CH2CH2CH3 and CH3CH2CH(CH3)2 Isomers
CH3CH2OH and CH3OCH2CH3 C2H6O / C3H8O – Not even close
1-butene and 2-methylpropane C4H8 / C4H10 Close, but no cigar.
With common names, both #2 are pentanes. but the first is “n-pentane” and the second is “isopentane”